chore(package): update commitizen to version 4.0.5

Closes #42

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
   },
   "devDependencies": {
     "@asset-pipe/sink-fs": "^1.1.4",
-    "commitizen": "^3.0.5",
+    "commitizen": "^4.0.5",
     "cz-conventional-changelog": "^2.0.0",
     "eslint": "^5.10.0",
     "eslint-config-finn": "^3.0.1",