chore: added commitizen (#143)

* chore(package): added commitizen

I added `git-cz` (commitizen) with the angular adapter (which seems to work)

* docs(readme): added cz badge

Added the badge to indicate the commitizen-friendliness of this repo.

* revert: removed the category changes from another PR

It removes the addition of a maintenance category to keep them separated.

README.md

@@ -13,6 +13,7 @@
 [![version][version-badge]][package] [![downloads][downloads-badge]][downloads]
 [![MIT License][license-badge]][license]
 [![Chat on Slack][chat-badge]][chat]
+[![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
 
 [![All Contributors](https://img.shields.io/badge/all_contributors-28-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs] [![Code of Conduct][coc-badge]][coc]

package.json

@@ -17,7 +17,8 @@
     "build": "kcd-scripts build",
     "lint": "kcd-scripts lint",
     "test": "kcd-scripts test",
-    "validate": "kcd-scripts validate"
+    "validate": "kcd-scripts validate",
+    "commit": "npx git-cz"
   },
   "husky": {
     "hooks": {
@@ -50,6 +51,8 @@
   },
   "devDependencies": {
     "codecov": "^3.1.0",
+    "cz-conventional-changelog": "^2.1.0",
+    "git-cz": "^1.8.0",
     "kcd-scripts": "^0.49.0",
     "nock": "^10.0.6",
     "semantic-release": "^15.13.2"
@@ -68,5 +71,10 @@
       "func-names": "off",
       "consistent-return": "off"
     }
+  },
+  "config": {
+    "commitizen": {
+      "path": "cz-conventional-changelog"
+    }
   }
 }