Added vulcanize under third_party/npm_modules

node_modules/vulcanize/node_modules/update-notifier/node_modules/semver-diff/readme.md

Index: node_modules/vulcanize/node_modules/update-notifier/node_modules/semver-diff/readme.md
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+# semver-diff [![Build Status](https://travis-ci.org/sindresorhus/semver-diff.svg?branch=master)](https://travis-ci.org/sindresorhus/semver-diff)
+
+> Get the diff type of two [semver](https://github.com/isaacs/node-semver) versions: `0.0.1 0.0.2` → `patch`
+
+
+## Install
+
+```sh
+$ npm install --save semver-diff
+```
+
+
+## Usage
+
+```js
+var semverDiff = require('semver-diff');
+
+semverDiff('1.1.1', '1.1.2');
+//=> 'patch'
+
+semverDiff('0.0.1', '1.0.0');
+//=> 'major'
+
+semverDiff('0.1.0', '0.1.0+foo');
+//=> 'build'
+
+semverDiff('0.0.1', '0.0.1');
+//=> null
+
+semverDiff('0.0.2', '0.0.1');
+//=> null
+```
+
+
+## API
+
+### semverDiff(versionA, versionB)
+
+Returns the difference type between two semver versions, or `null` if they're identical or the second one is lower than the first.
+
+Possible values: `'major'`, `'minor'`, `'patch'`, `'prerelease'`, `'build'`, `null`.
+
+
+## License
+
+MIT © [Sindre Sorhus](http://sindresorhus.com)