chore: configure commit linting and generated changelogs (#350)

* chore: configure conventional-changelog and standard-version

* chore(ci): use commitlint-travis on travis

* chore(ci): build master and prs only on appveyor

.travis.yml

@@ -7,6 +7,8 @@ matrix:
   include:
     - node_js: node
       env: NPM_SCRIPT=lint
+    - node_js: node
+      env: NPM_SCRIPT=commitlint-travis
     - node_js: node
       env: NPM_INSTALL_EXTRA="webpack@4 file-loader@1 html-webpack-plugin@3.2.0"
     - node_js: 8

appveyor.yml

@@ -36,3 +36,7 @@ test_script:
 
 # Don't actually build.
 build: off
+
+branches:
+  only:
+    - master

package.json

@@ -23,13 +23,18 @@
     "url": "https://github.com/mzgoddard/hard-source-webpack-plugin/issues"
   },
   "scripts": {
+    "commitmsg": "commitlint -e $GIT_PARAMS",
+    "commitlint-travis": "commitlint-travis",
     "lint": "prettier --list-different --single-quote --trailing-comma all {index.js,lib/*.js,lib/util/*.js,test/*.js,test/*/*.js,bin/*.js}",
     "lint:fix": "prettier --write --single-quote --trailing-comma all {index.js,lib/*.js,lib/util/*.js,test/*.js,test/*/*.js,bin/*.js}",
     "test": "NODE_ENV=test mocha tests/*.js"
   },
   "author": "Michael \"Z\" Goddard <mzgoddard@gmail.com>",
   "license": "ISC",
   "devDependencies": {
+    "@commitlint/cli": "^6.2.0",
+    "@commitlint/config-conventional": "^6.1.3",
+    "@commitlint/travis-cli": "^6.2.0",
     "babel-core": "^6.26.0",
     "babel-loader": "^7.1.4",
     "babel-preset-env": "^1.6.1",
@@ -39,12 +44,14 @@
     "extract-text-webpack-plugin": "^3.0.0 || ^2.0.0 || ^1.0.1",
     "file-loader": "^1.0.0 || ^0.11.0 || ^0.10.1",
     "html-webpack-plugin": "^3.2.0 || ^2.22.0",
+    "husky": "^0.14.3",
     "level": "^4.0.0",
     "memory-fs": "^0.4.1",
     "mini-css-extract-plugin": "^0.4.0",
     "mocha": "^3.0.2",
     "prettier": "^1.12.1",
     "source-map": "^0.5.6",
+    "standard-version": "^4.4.0",
     "style-loader": "^0.14.0",
     "webpack": "^4.0.0 || ^4.0.0-beta.* || ^3.8.1 || ^3.0.0 || ^3.0.0-rc.0 || ^2.1.0 || ^1.13.1",
     "webpack-cli": "^2.1.4",