diff --git a/package-lock.json b/package-lock.json
index cf78340..af6cb36 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,19 +4,48 @@
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   "requires": true,
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+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
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+      "dev": true,
+      "requires": {
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+        "esutils": "^2.0.2",
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+          "dev": true
+        }
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-      "resolved": "https://registry.npmjs.org/@gnosis.pm/util-contracts/-/util-contracts-2.0.2.tgz",
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+      "version": "github:okwme/util-contracts#965944b7eda11cba4445aaa43aad13ae9b245ddd",
+      "from": "github:okwme/util-contracts#patch-1",
       "dev": true
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+      "resolved": "https://registry.npmjs.org/@nomiclabs/buidler/-/buidler-1.0.2.tgz",
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       "dev": true,
       "requires": {
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+        "@types/lru-cache": "^5.1.0",
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@@ -26,8 +55,12 @@
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         "enquirer": "^2.3.0",
-        "ethereumjs-common": "^1.3.0",
-        "ethereumjs-tx": "^2.0.0",
+        "eth-sig-util": "^2.5.2",
+        "ethereumjs-abi": "^0.6.8",
+        "ethereumjs-account": "^3.0.0",
+        "ethereumjs-block": "^2.2.0",
+        "ethereumjs-common": "^1.3.2",
+        "ethereumjs-tx": "^2.1.1",
         "ethereumjs-util": "^6.1.0",
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@@ -36,34 +69,456 @@
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         "lodash": "^4.17.11",
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         "qs": "^6.7.0",
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-        "solc": "0.5.8",
+        "semver": "^6.3.0",
+        "solc": "0.5.15",
         "solidity-parser-antlr": "^0.4.2",
-        "source-map-support": "^0.5.12",
+        "source-map-support": "^0.5.13",
         "ts-essentials": "^2.0.7",
         "tsort": "0.0.1",
         "uuid": "^3.3.2"
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+          "dev": true,
+          "requires": {
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+        "eth-sig-util": {
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+            "ethereumjs-abi": "0.6.5",
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+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.18.0.tgz",
+          "integrity": "sha512-6CYPa+JP2ftfRU2qkDK+UTVeQYosOg/2GbcjIcKPHfinyOLPVGXu/ovN86RP49Re5ndJK1N0kuiidFFuepc4ZQ==",
+          "dev": true
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
     "solidity-coverage": {
       "version": "0.5.8",
       "resolved": "https://registry.npmjs.org/solidity-coverage/-/solidity-coverage-0.5.8.tgz",
@@ -10606,6 +12004,12 @@
       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
       "dev": true
     },
+    "stealthy-require": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/stealthy-require/-/stealthy-require-1.1.1.tgz",
+      "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks=",
+      "dev": true
+    },
     "strict-uri-encode": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
@@ -10697,12 +12101,6 @@
         "is-natural-number": "^4.0.1"
       }
     },
-    "strip-eof": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
-      "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
-      "dev": true
-    },
     "strip-hex-prefix": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/strip-hex-prefix/-/strip-hex-prefix-1.0.0.tgz",
@@ -10712,6 +12110,12 @@
         "is-hex-prefixed": "1.0.0"
       }
     },
+    "strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+      "dev": true
+    },
     "strip-outer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/strip-outer/-/strip-outer-1.0.1.tgz",
@@ -10821,6 +12225,46 @@
         }
       }
     },
+    "table": {
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
     "tape": {
       "version": "4.11.0",
       "resolved": "https://registry.npmjs.org/tape/-/tape-4.11.0.tgz",
@@ -10908,6 +12352,12 @@
         "xtend": "^4.0.0"
       }
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -11261,28 +12711,47 @@
       "dev": true
     },
     "truffle-contract": {
-      "version": "4.0.31",
-      "resolved": "https://registry.npmjs.org/truffle-contract/-/truffle-contract-4.0.31.tgz",
-      "integrity": "sha512-u3q+p1wiX5C2GpnluGx/d2iaJk7bcWshk2/TohiJyA2iQiTfkS7M4n9D9tY3JqpXR8PmD/TrA69RylO0RhITFA==",
+      "version": "3.0.8",
+      "resolved": "https://registry.npmjs.org/truffle-contract/-/truffle-contract-3.0.8.tgz",
+      "integrity": "sha512-uhXb/G4dORU4RjFlwZZbFT0n5BS8akify+MaRsnWWs4SA/bo6x4/bQs1xtdO3b5Cl9nXiOX88wdQzRj3xtPVUg==",
       "dev": true,
       "requires": {
-        "@truffle/blockchain-utils": "^0.0.11",
-        "@truffle/contract-schema": "^3.0.14",
-        "@truffle/error": "^0.0.6",
-        "bignumber.js": "^7.2.1",
-        "ethers": "^4.0.0-beta.1",
-        "truffle-interface-adapter": "^0.2.5",
-        "web3": "1.2.1",
-        "web3-core-promievent": "1.2.1",
-        "web3-eth-abi": "1.2.1",
-        "web3-utils": "1.2.1"
+        "ethjs-abi": "0.1.8",
+        "truffle-blockchain-utils": "^0.0.5",
+        "truffle-contract-schema": "^2.0.3",
+        "truffle-error": "^0.0.3",
+        "web3": "0.20.6"
       },
       "dependencies": {
         "bignumber.js": {
-          "version": "7.2.1",
-          "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-7.2.1.tgz",
-          "integrity": "sha512-S4XzBk5sMB+Rcb/LNcpzXr57VRTxgAvaAEDAl1AwRx27j00hT84O6OkteE7u8UB3NuaaygCRrEpqox4uDOrbdQ==",
+          "version": "git+https://github.com/frozeman/bignumber.js-nolookahead.git#57692b3ecfc98bbdd6b3a516cb2353652ea49934",
+          "from": "git+https://github.com/frozeman/bignumber.js-nolookahead.git",
+          "dev": true
+        },
+        "crypto-js": {
+          "version": "3.1.8",
+          "resolved": "https://registry.npmjs.org/crypto-js/-/crypto-js-3.1.8.tgz",
+          "integrity": "sha1-cV8HC/YBTyrpkqmLOSkli3E/CNU=",
+          "dev": true
+        },
+        "utf8": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/utf8/-/utf8-2.1.2.tgz",
+          "integrity": "sha1-H6DZJw6b6FDZsFAn9jUZv0ZFfZY=",
           "dev": true
+        },
+        "web3": {
+          "version": "0.20.6",
+          "resolved": "https://registry.npmjs.org/web3/-/web3-0.20.6.tgz",
+          "integrity": "sha1-PpcwauAk+yThCj11yIQwJWIhUSA=",
+          "dev": true,
+          "requires": {
+            "bignumber.js": "git+https://github.com/frozeman/bignumber.js-nolookahead.git",
+            "crypto-js": "^3.1.4",
+            "utf8": "^2.1.1",
+            "xhr2": "*",
+            "xmlhttprequest": "*"
+          }
         }
       }
     },
@@ -11408,24 +12877,18 @@
         }
       }
     },
-    "truffle-interface-adapter": {
-      "version": "0.2.5",
-      "resolved": "https://registry.npmjs.org/truffle-interface-adapter/-/truffle-interface-adapter-0.2.5.tgz",
-      "integrity": "sha512-EL39OpP8FcZ99ne1Rno3jImfb92Nectd4iVsZzoEUCBfbwHe7sr0k+i45guoruSoP8nMUE81Mov2s8I5pi6d9Q==",
-      "dev": true,
-      "requires": {
-        "bn.js": "^4.11.8",
-        "ethers": "^4.0.32",
-        "lodash": "^4.17.13",
-        "web3": "1.2.1"
-      }
-    },
     "ts-essentials": {
       "version": "2.0.12",
       "resolved": "https://registry.npmjs.org/ts-essentials/-/ts-essentials-2.0.12.tgz",
       "integrity": "sha512-3IVX4nI6B5cc31/GFFE+i8ey/N2eA0CZDbo6n0yrz0zDX8ZJ8djmU1p+XRz7G3is0F3bB3pu2pAroFdAWQKU3w==",
       "dev": true
     },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "dev": true
+    },
     "tsort": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/tsort/-/tsort-0.0.1.tgz",
@@ -11447,6 +12910,12 @@
       "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
       "dev": true
     },
+    "tweetnacl-util": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/tweetnacl-util/-/tweetnacl-util-0.15.0.tgz",
+      "integrity": "sha1-RXbBzuXi1j0gf+5S8boCgZSAvHU=",
+      "dev": true
+    },
     "type": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/type/-/type-1.0.3.tgz",
@@ -11601,6 +13070,16 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "util.promisify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
+      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "object.getownpropertydescriptors": "^2.0.3"
+      }
+    },
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -12213,12 +13692,6 @@
         "isexe": "^2.0.0"
       }
     },
-    "which-module": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
-    },
     "wif": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/wif/-/wif-2.0.6.tgz",
@@ -12293,6 +13766,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "ws": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
@@ -12388,40 +13870,11 @@
       "dev": true
     },
     "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
       "dev": true
     },
-    "yargs": {
-      "version": "11.1.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
-      "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
-      "dev": true,
-      "requires": {
-        "cliui": "^4.0.0",
-        "decamelize": "^1.1.1",
-        "find-up": "^2.1.0",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^2.0.0",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
-        "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^3.2.1",
-        "yargs-parser": "^9.0.2"
-      }
-    },
-    "yargs-parser": {
-      "version": "9.0.2",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
-      "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
-      "dev": true,
-      "requires": {
-        "camelcase": "^4.1.0"
-      }
-    },
     "yauzl": {
       "version": "2.10.0",
       "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
@@ -12433,9 +13886,9 @@
       }
     },
     "zeppelin-solidity": {
-      "version": "1.12.0",
-      "resolved": "https://registry.npmjs.org/zeppelin-solidity/-/zeppelin-solidity-1.12.0.tgz",
-      "integrity": "sha512-dgjPPnTmx14hAbTeOpTKemDeDCDdwglS0nquOAJG8h5o9zlb43FZafQSrMlIUUSp1EisDZfehrp5loGEYXHZBA==",
+      "version": "1.11.0",
+      "resolved": "https://registry.npmjs.org/zeppelin-solidity/-/zeppelin-solidity-1.11.0.tgz",
+      "integrity": "sha512-fn5P4wtFqbW5W4zrqDuGOgCIo7kCMYWSto58NCv2SJLlJbR80l0inHVGUOtZ9ECO7fJy/3Myr27tAczfrR7gVg==",
       "dev": true
     }
   }
diff --git a/yarn.lock b/yarn.lock
index 56d80c5..08fdaa6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2136,10 +2136,10 @@ commander@2.18.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.18.0.tgz#2bf063ddee7c7891176981a2cc798e5754bc6970"
   integrity sha512-6CYPa+JP2ftfRU2qkDK+UTVeQYosOg/2GbcjIcKPHfinyOLPVGXu/ovN86RP49Re5ndJK1N0kuiidFFuepc4ZQ==
 
-commander@~2.20.0:
-  version "2.20.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
-  integrity sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==
+commander@~2.20.3:
+  version "2.20.3"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
+  integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
 
 commander@~2.8.1:
   version "2.8.1"
@@ -4396,9 +4396,9 @@ gulplog@^1.0.0:
     glogg "^1.0.0"
 
 handlebars@^4.0.1:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.2.0.tgz#57ce8d2175b9bbb3d8b3cf3e4217b1aec8ddcb2e"
-  integrity sha512-Kb4xn5Qh1cxAKvQnzNWZ512DhABzyFNmsaJf3OAkWNa4NkaqWcNI8Tao8Tasi0/F4JD9oyG0YxuFyvyR57d+Gw==
+  version "4.5.3"
+  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.5.3.tgz#5cf75bd8714f7605713511a56be7c349becb0482"
+  integrity sha512-3yPecJoJHK/4c6aZhSvxOyG4vJKDshV36VHp0iVCDVh7o9w2vwi3NSnL2MMPj3YdduqaBcu7cGbggJQM0br9xA==
   dependencies:
     neo-async "^2.6.0"
     optimist "^0.6.1"
@@ -9152,11 +9152,11 @@ typeforce@^1.11.5:
   integrity sha512-7uc1O8h1M1g0rArakJdf0uLRSSgFcYexrVoKo+bzJd32gd4gDy2L/Z+8/FjPnU9ydY3pEnVPtr9FyscYY60K1g==
 
 uglify-js@^3.1.4:
-  version "3.6.0"
-  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.6.0.tgz#704681345c53a8b2079fb6cec294b05ead242ff5"
-  integrity sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==
+  version "3.7.3"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.7.3.tgz#f918fce9182f466d5140f24bb0ff35c2d32dcc6a"
+  integrity sha512-7tINm46/3puUA4hCkKYo4Xdts+JDaVC9ZPRcG8Xw9R4nhO/gZgUM3TENq8IF4Vatk8qCig4MzP/c8G4u2BkVQg==
   dependencies:
-    commander "~2.20.0"
+    commander "~2.20.3"
     source-map "~0.6.1"
 
 uid-number@0.0.6: