chore: update CHANGELOG automation to use conventional-changelog (#3669)

This updates our changelog automation to use conventinoal changelog. Ultimately, it will make it easier to merge PRs because it won't require the use of the contrib tool.
It uses https://github.com/videojs/conventional-changelog-videojs/blob/master/convention.md

CHANGELOG.md

@@ -1,11 +1,3 @@
-CHANGELOG
-=========
-
-## HEAD (Unreleased)
-_(none)_
-
---------------------
-
 ## 5.12.2 (2016-09-28)
 * Changes from 5.11.7 on the 5.12 branch
 

build/grunt.js

@@ -1,5 +1,6 @@
 import {gruntCustomizer, gruntOptionsMaker} from './options-customizer.js';
 import chg from 'chg';
+import nodeCli from 'shelljs-nodecli';
 
 module.exports = function(grunt) {
   require('time-grunt')(grunt);
@@ -31,7 +32,7 @@ module.exports = function(grunt) {
       release: {
         tag_name: 'v'+ version.full,
         name: version.full,
-        body: chg.find(version.full).changesRaw
+        body: nodeCli.exec('conventional-changelog', '-p videojs', {silent: true}).output
       },
     },
     files: {

contrib.json

@@ -280,7 +280,7 @@
         [ "git checkout -b temp-release-branch master","Create a temporary branch for the dist" ],
         [ "grunt version:{{release_type}}",            "Bump package versions" ],
         [ "./build/bin/version",                       "Return the current VJS Version from the package.json file", "version" ],
-        [ "grunt chg-release:{{version}}",             "Update the changelog with the new release" ],
+        [ "npm run changelog",                         "Update the changelog with the new release" ],
         [ "git commit -am 'v{{version}}'",             "Add and commit the package changes" ],
         [ "git checkout master",                       "Checkout the developmet branch" ],
         [ "git merge temp-release-branch",             "Merge package changes into the dev brach" ],
@@ -306,7 +306,7 @@
         [ "grunt test",                                "Run tests" ],
         [ "grunt version:{{release_type}}",            "Bump package versions" ],
         [ "./build/bin/version",                       "Return the current VJS Version from the package.json file", "version" ],
-        [ "grunt chg-release:{{version}}",             "Update the changelog with the new release" ],
+        [ "npm run changelog",                         "Update the changelog with the new release" ],
         [ "git commit -am 'v{{version}}'",             "Add and commit the package changes" ],
         [ "git push upstream stable",                  "Push the release branch changes to the repo" ],
         [ "git checkout -b temp-release-branch stable","Create a temporary branch for the dist" ],

package.json

@@ -16,6 +16,7 @@
   "homepage": "http://videojs.com",
   "author": "Steve Heffernan",
   "scripts": {
+    "changelog": "conventional-changelog -p videojs -i CHANGELOG.md -s",
     "build": "grunt dist",
     "change": "grunt chg-add",
     "clean": "grunt clean",
@@ -55,13 +56,15 @@
     "browserify-versionify": "^1.0.4",
     "bundle-collapser": "^1.2.1",
     "chg": "^0.3.2",
+    "conventional-changelog-cli": "^1.2.0",
+    "conventional-changelog-videojs": "^3.0.0",
     "es5-shim": "^4.1.3",
     "es6-shim": "^0.35.1",
     "ghooks": "^1.3.2",
     "gkatsev-grunt-sass": "^1.1.1",
     "grunt": "^0.4.4",
-    "grunt-babel": "^6.0.0",
     "grunt-accessibility": "^4.1.0",
+    "grunt-babel": "^6.0.0",
     "grunt-banner": "^0.4.0",
     "grunt-browserify": "3.5.1",
     "grunt-cli": "~0.1.13",
@@ -97,6 +100,7 @@
     "markdown-table": "^1.0.0",
     "proxyquireify": "^3.0.0",
     "qunitjs": "^1.23.1",
+    "shelljs-nodecli": "^0.1.1",
     "sinon": "^1.16.1",
     "time-grunt": "^1.1.1",
     "uglify-js": "~2.7.3",