chore: Add commitizen

package.json

@@ -12,6 +12,7 @@
   ],
   "scripts": {
     "pretest": "semistandard",
+    "commit": "git-cz",
     "build-examples": "node examples/build-examples.js",
     "test": "jasmine",
     "release": "standard-version"
@@ -23,7 +24,9 @@
   },
   "devDependencies": {
     "appcache-webpack-plugin": "^1.3.0",
+    "commitizen": "2.9.6",
     "css-loader": "^0.26.1",
+    "cz-conventional-changelog": "2.1.0",
     "dir-compare": "1.3.0",
     "es6-promise": "^4.0.5",
     "extract-text-webpack-plugin": "^1.0.1",
@@ -65,5 +68,10 @@
   "repository": "https://github.com/jantimon/html-webpack-plugin.git",
   "engines": {
     "node": ">=6.11.5"
+  },
+  "config": {
+    "commitizen": {
+      "path": "./node_modules/cz-conventional-changelog"
+    }
   }
 }