Upgrade vulcanize to 0.7.6.

node_modules/vulcanize/node_modules/update-notifier/node_modules/configstore/node_modules/js-yaml/lib/js-yaml/type/null.js

Index: node_modules/vulcanize/node_modules/update-notifier/node_modules/configstore/node_modules/js-yaml/lib/js-yaml/type/null.js
diff --git a/node_modules/vulcanize/node_modules/update-notifier/node_modules/configstore/node_modules/js-yaml/lib/js-yaml/type/null.js b/node_modules/vulcanize/node_modules/update-notifier/node_modules/configstore/node_modules/js-yaml/lib/js-yaml/type/null.js
index 3ea02df27685ae566af792130b58747309d18627..3474055698f5ddb7e11085766431ad16b4a8fc58 100644
--- a/node_modules/vulcanize/node_modules/update-notifier/node_modules/configstore/node_modules/js-yaml/lib/js-yaml/type/null.js
+++ b/node_modules/vulcanize/node_modules/update-notifier/node_modules/configstore/node_modules/js-yaml/lib/js-yaml/type/null.js
@@ -1,40 +1,36 @@
 'use strict';
 
-
 var Type = require('../type');
 
-
-var YAML_NULL_MAP = {
-  '~'    : true,
-  'null' : true,
-  'Null' : true,
-  'NULL' : true
-};
-
-
-function resolveYamlNull(state) {
-  if (YAML_NULL_MAP.hasOwnProperty(state.result)) {
-    state.result = null;
+function resolveYamlNull(data) {
+  if (null === data) {
     return true;
   }
-  return false;
+
+  var max = data.length;
+
+  return (max === 1 && data === '~') ||
+         (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
 }
 
+function constructYamlNull() {
+  return null;
+}
 
 function isNull(object) {
   return null === object;
 }
 
-
 module.exports = new Type('tag:yaml.org,2002:null', {
-  loadKind: 'scalar',
-  loadResolver: resolveYamlNull,
-  dumpPredicate: isNull,
-  dumpRepresenter: {
+  kind: 'scalar',
+  resolve: resolveYamlNull,
+  construct: constructYamlNull,
+  predicate: isNull,
+  represent: {
     canonical: function () { return '~';    },
     lowercase: function () { return 'null'; },
     uppercase: function () { return 'NULL'; },
     camelcase: function () { return 'Null'; }
   },
-  dumpDefaultStyle: 'lowercase'
+  defaultStyle: 'lowercase'
 });