diff --git a/example/package-lock.json b/example/package-lock.json
index 74af14e..69469cc 100644
--- a/example/package-lock.json
+++ b/example/package-lock.json
@@ -2847,7 +2847,8 @@
                 },
                 "ansi-regex": {
                     "version": "2.1.1",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "aproba": {
                     "version": "1.2.0",
@@ -2865,11 +2866,13 @@
                 },
                 "balanced-match": {
                     "version": "1.0.0",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "brace-expansion": {
                     "version": "1.1.11",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "balanced-match": "^1.0.0",
                         "concat-map": "0.0.1"
@@ -2882,15 +2885,18 @@
                 },
                 "code-point-at": {
                     "version": "1.1.0",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "concat-map": {
                     "version": "0.0.1",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "console-control-strings": {
                     "version": "1.1.0",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "core-util-is": {
                     "version": "1.0.2",
@@ -2993,7 +2999,8 @@
                 },
                 "inherits": {
                     "version": "2.0.3",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "ini": {
                     "version": "1.3.5",
@@ -3003,6 +3010,7 @@
                 "is-fullwidth-code-point": {
                     "version": "1.0.0",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "number-is-nan": "^1.0.0"
                     }
@@ -3015,17 +3023,20 @@
                 "minimatch": {
                     "version": "3.0.4",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "brace-expansion": "^1.1.7"
                     }
                 },
                 "minimist": {
                     "version": "0.0.8",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "minipass": {
                     "version": "2.3.5",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "safe-buffer": "^5.1.2",
                         "yallist": "^3.0.0"
@@ -3042,6 +3053,7 @@
                 "mkdirp": {
                     "version": "0.5.1",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "minimist": "0.0.8"
                     }
@@ -3114,7 +3126,8 @@
                 },
                 "number-is-nan": {
                     "version": "1.0.1",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "object-assign": {
                     "version": "4.1.1",
@@ -3124,6 +3137,7 @@
                 "once": {
                     "version": "1.4.0",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "wrappy": "1"
                     }
@@ -3199,7 +3213,8 @@
                 },
                 "safe-buffer": {
                     "version": "5.1.2",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "safer-buffer": {
                     "version": "2.1.2",
@@ -3229,6 +3244,7 @@
                 "string-width": {
                     "version": "1.0.2",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "code-point-at": "^1.0.0",
                         "is-fullwidth-code-point": "^1.0.0",
@@ -3246,6 +3262,7 @@
                 "strip-ansi": {
                     "version": "3.0.1",
                     "bundled": true,
+                    "optional": true,
                     "requires": {
                         "ansi-regex": "^2.0.0"
                     }
@@ -3284,11 +3301,13 @@
                 },
                 "wrappy": {
                     "version": "1.0.2",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 },
                 "yallist": {
                     "version": "3.0.3",
-                    "bundled": true
+                    "bundled": true,
+                    "optional": true
                 }
             }
         },
@@ -3396,15 +3415,24 @@
             "integrity": "sha1-8QdIy+dq+WS3yWyTxrzCivEgwIE="
         },
         "handlebars": {
-            "version": "4.1.2",
-            "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.1.2.tgz",
-            "integrity": "sha512-nvfrjqvt9xQ8Z/w0ijewdD/vvWDTOweBUm96NTr66Wfvo1mJenBLwcYmPs3TIBP5ruzYGD7Hx/DaM9RmhroGPw==",
+            "version": "4.7.7",
+            "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.7.tgz",
+            "integrity": "sha512-aAcXm5OAfE/8IXkcZvCepKU3VzW1/39Fb5ZuqMtgI/hT8X2YgoMvBY5dLhq/cpOvw7Lk1nK/UF71aLG/ZnVYRA==",
             "dev": true,
             "requires": {
+                "minimist": "^1.2.5",
                 "neo-async": "^2.6.0",
-                "optimist": "^0.6.1",
                 "source-map": "^0.6.1",
-                "uglify-js": "^3.1.4"
+                "uglify-js": "^3.1.4",
+                "wordwrap": "^1.0.0"
+            },
+            "dependencies": {
+                "minimist": {
+                    "version": "1.2.5",
+                    "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+                    "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+                    "dev": true
+                }
             }
         },
         "har-schema": {
diff --git a/example/yarn.lock b/example/yarn.lock
index 8ed2891..471beb8 100644
--- a/example/yarn.lock
+++ b/example/yarn.lock
@@ -1402,7 +1402,7 @@ combined-stream@^1.0.6, combined-stream@~1.0.6:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@^2.19.0, commander@^2.9.0, commander@~2.20.0:
+commander@^2.19.0, commander@^2.9.0:
   version "2.20.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
 
@@ -2211,12 +2211,13 @@ growly@^1.3.0:
   resolved "https://registry.yarnpkg.com/growly/-/growly-1.3.0.tgz#f10748cbe76af964b7c96c93c6bcc28af120c081"
 
 handlebars@^4.1.2:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.1.2.tgz#b6b37c1ced0306b221e094fc7aca3ec23b131b67"
+  version "4.7.7"
+  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.7.7.tgz#9ce33416aad02dbd6c8fafa8240d5d98004945a1"
   dependencies:
+    minimist "^1.2.5"
     neo-async "^2.6.0"
-    optimist "^0.6.1"
     source-map "^0.6.1"
+    wordwrap "^1.0.0"
   optionalDependencies:
     uglify-js "^3.1.4"
 
@@ -3685,10 +3686,14 @@ minimist@0.0.8:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
-minimist@1.2.0, minimist@^1.1.1, minimist@^1.2.0:
+minimist@1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
+minimist@^1.1.1, minimist@^1.2.0, minimist@^1.2.5:
+  version "1.2.5"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
+
 minimist@~0.0.1:
   version "0.0.10"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"
@@ -3778,8 +3783,8 @@ negotiator@0.6.2:
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
 
 neo-async@^2.6.0:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/neo-async/-/neo-async-2.6.1.tgz#ac27ada66167fa8849a6addd837f6b189ad2081c"
+  version "2.6.2"
+  resolved "https://registry.yarnpkg.com/neo-async/-/neo-async-2.6.2.tgz#b4aafb93e3aeb2d8174ca53cf163ab7d7308305f"
 
 nice-try@^1.0.4:
   version "1.0.5"
@@ -5286,11 +5291,8 @@ uglify-es@^3.1.9:
     source-map "~0.6.1"
 
 uglify-js@^3.1.4:
-  version "3.5.12"
-  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.5.12.tgz#6b759cabc08c3e91fe82323d6387019f0c5864cd"
-  dependencies:
-    commander "~2.20.0"
-    source-map "~0.6.1"
+  version "3.13.5"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.13.5.tgz#5d71d6dbba64cf441f32929b1efce7365bb4f113"
 
 ultron@1.0.x:
   version "1.0.2"