diff --git a/package-lock.json b/package-lock.json
index 3592f74..4053381 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -85,7 +85,7 @@
       "dependencies": {
         "acorn": {
           "version": "3.3.0",
-          "resolved": "http://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
           "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
           "dev": true
         }
@@ -309,7 +309,7 @@
         },
         "util": {
           "version": "0.10.3",
-          "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
           "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
           "dev": true,
           "requires": {
@@ -1304,7 +1304,7 @@
       "dependencies": {
         "resolve": {
           "version": "1.1.7",
-          "resolved": "http://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz",
           "integrity": "sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=",
           "dev": true
         }
@@ -1378,7 +1378,7 @@
           "dependencies": {
             "readable-stream": {
               "version": "2.0.6",
-              "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
+              "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
               "integrity": "sha1-j5A0HmilPMySh4jaz80Rs265t44=",
               "dev": true,
               "requires": {
@@ -1392,7 +1392,7 @@
             },
             "string_decoder": {
               "version": "0.10.31",
-              "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+              "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
               "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
               "dev": true
             }
@@ -1483,7 +1483,7 @@
       "dependencies": {
         "resolve": {
           "version": "0.6.3",
-          "resolved": "http://registry.npmjs.org/resolve/-/resolve-0.6.3.tgz",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-0.6.3.tgz",
           "integrity": "sha1-3ZV5gufnNt699TtYpN2RdUV13UY=",
           "dev": true
         }
@@ -1643,7 +1643,7 @@
     },
     "chalk": {
       "version": "1.1.3",
-      "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
       "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
       "dev": true,
       "requires": {
@@ -1770,7 +1770,7 @@
         },
         "slice-ansi": {
           "version": "0.0.4",
-          "resolved": "http://registry.npmjs.org/slice-ansi/-/slice-ansi-0.0.4.tgz",
+          "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-0.0.4.tgz",
           "integrity": "sha1-7b+JA/ZvfOL46v1s7tZeJkyDGzU=",
           "dev": true
         },
@@ -1891,7 +1891,7 @@
       "dependencies": {
         "convert-source-map": {
           "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/convert-source-map/-/convert-source-map-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.1.3.tgz",
           "integrity": "sha1-SCnId+n+SbMWHzvzZziI4gRpmGA=",
           "dev": true
         }
@@ -1993,7 +1993,7 @@
     },
     "cosmiconfig": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/cosmiconfig/-/cosmiconfig-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-1.1.0.tgz",
       "integrity": "sha1-DeoPmATv37kp+7GxiOJVU+oFPTc=",
       "dev": true,
       "requires": {
@@ -2009,7 +2009,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -2368,18 +2368,32 @@
       "dev": true
     },
     "elliptic": {
-      "version": "6.4.1",
-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.4.1.tgz",
-      "integrity": "sha512-BsXLz5sqX8OHcsh7CqBMztyXARmGQ3LWPtGjJi6DiJHq5C/qvi9P3OqgswKSDftbu8+IoI/QDTAm2fFnQ9SZSQ==",
+      "version": "6.5.4",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
       "dev": true,
       "requires": {
-        "bn.js": "^4.4.0",
-        "brorand": "^1.0.1",
+        "bn.js": "^4.11.9",
+        "brorand": "^1.1.0",
         "hash.js": "^1.0.0",
-        "hmac-drbg": "^1.0.0",
-        "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0",
-        "minimalistic-crypto-utils": "^1.0.0"
+        "hmac-drbg": "^1.0.1",
+        "inherits": "^2.0.4",
+        "minimalistic-assert": "^1.0.1",
+        "minimalistic-crypto-utils": "^1.0.1"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.12.0",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+          "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+          "dev": true
+        },
+        "inherits": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+          "dev": true
+        }
       }
     },
     "encoding": {
@@ -2467,7 +2481,7 @@
         },
         "source-map": {
           "version": "0.1.43",
-          "resolved": "http://registry.npmjs.org/source-map/-/source-map-0.1.43.tgz",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.1.43.tgz",
           "integrity": "sha1-wkvBRspRfBRx9drL4lcbK3+eM0Y=",
           "dev": true,
           "optional": true,
@@ -2684,7 +2698,7 @@
         },
         "readable-stream": {
           "version": "1.0.34",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
           "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
           "dev": true,
           "requires": {
@@ -2696,13 +2710,13 @@
         },
         "string_decoder": {
           "version": "0.10.31",
-          "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
           "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
           "dev": true
         },
         "through2": {
           "version": "0.4.2",
-          "resolved": "http://registry.npmjs.org/through2/-/through2-0.4.2.tgz",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-0.4.2.tgz",
           "integrity": "sha1-2/WGYDEVHsg1K7bE22SiKSqEC5s=",
           "dev": true,
           "requires": {
@@ -2776,7 +2790,7 @@
     },
     "fast-deep-equal": {
       "version": "1.1.0",
-      "resolved": "http://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz",
       "integrity": "sha1-wFNHeBfIa1HaqFPIHgWbcz0CNhQ=",
       "dev": true
     },
@@ -2809,7 +2823,7 @@
       "dependencies": {
         "core-js": {
           "version": "1.2.7",
-          "resolved": "http://registry.npmjs.org/core-js/-/core-js-1.2.7.tgz",
+          "resolved": "https://registry.npmjs.org/core-js/-/core-js-1.2.7.tgz",
           "integrity": "sha1-ZSKUwUZR2yj6k70tX/KYOk8IxjY=",
           "dev": true
         }
@@ -4970,7 +4984,7 @@
         },
         "onetime": {
           "version": "1.1.0",
-          "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
           "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
           "dev": true
         },
@@ -5092,7 +5106,7 @@
         },
         "onetime": {
           "version": "1.1.0",
-          "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
           "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
           "dev": true
         },
@@ -5265,7 +5279,7 @@
     },
     "minimist": {
       "version": "0.0.8",
-      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
       "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
       "dev": true
     },
@@ -5292,7 +5306,7 @@
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "dev": true,
       "requires": {
@@ -5335,7 +5349,7 @@
           "dependencies": {
             "readable-stream": {
               "version": "2.0.6",
-              "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
+              "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
               "integrity": "sha1-j5A0HmilPMySh4jaz80Rs265t44=",
               "dev": true,
               "requires": {
@@ -5357,7 +5371,7 @@
         },
         "string_decoder": {
           "version": "0.10.31",
-          "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
           "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
           "dev": true
         }
@@ -5638,7 +5652,7 @@
     },
     "ora": {
       "version": "0.2.3",
-      "resolved": "http://registry.npmjs.org/ora/-/ora-0.2.3.tgz",
+      "resolved": "https://registry.npmjs.org/ora/-/ora-0.2.3.tgz",
       "integrity": "sha1-N1J9Igrc1Tw5tzVx11QVbV22V6Q=",
       "dev": true,
       "requires": {
@@ -5659,7 +5673,7 @@
         },
         "onetime": {
           "version": "1.1.0",
-          "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
           "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
           "dev": true
         },
@@ -5683,7 +5697,7 @@
     },
     "os-homedir": {
       "version": "1.0.2",
-      "resolved": "http://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
+      "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
       "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
       "dev": true
     },
@@ -5717,7 +5731,7 @@
     },
     "os-tmpdir": {
       "version": "1.0.2",
-      "resolved": "http://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
+      "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
       "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
       "dev": true
     },
@@ -5861,7 +5875,7 @@
     },
     "path-is-absolute": {
       "version": "1.0.1",
-      "resolved": "http://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
       "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
       "dev": true
     },
@@ -6110,7 +6124,7 @@
         },
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -6143,7 +6157,7 @@
         },
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -6176,7 +6190,7 @@
         },
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -6460,7 +6474,7 @@
     },
     "readable-stream": {
       "version": "2.3.6",
-      "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
       "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
       "dev": true,
       "requires": {
@@ -6853,7 +6867,7 @@
       "dependencies": {
         "detective": {
           "version": "3.1.0",
-          "resolved": "http://registry.npmjs.org/detective/-/detective-3.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/detective/-/detective-3.1.0.tgz",
           "integrity": "sha1-d3gkRKt1K4jKG+Lp0KA5Xx2iXu0=",
           "dev": true,
           "requires": {
@@ -7580,7 +7594,7 @@
     },
     "string_decoder": {
       "version": "1.1.1",
-      "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
       "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
       "dev": true,
       "requires": {
@@ -7600,7 +7614,7 @@
     },
     "strip-ansi": {
       "version": "3.0.1",
-      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "dev": true,
       "requires": {
@@ -7642,7 +7656,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -7885,7 +7899,7 @@
         },
         "readable-stream": {
           "version": "1.1.14",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
           "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
           "dev": true,
           "requires": {
@@ -7897,7 +7911,7 @@
         },
         "string_decoder": {
           "version": "0.10.31",
-          "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
           "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
           "dev": true
         }
@@ -8007,7 +8021,7 @@
         },
         "convert-source-map": {
           "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/convert-source-map/-/convert-source-map-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.1.3.tgz",
           "integrity": "sha1-SCnId+n+SbMWHzvzZziI4gRpmGA=",
           "dev": true
         },