chore(package): update commitizen to version 4.0.1

Closes #31

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "@types/jest": "^24.0.15",
     "@types/lodash": "^4.14.135",
     "@types/node": "^12.0.10",
-    "commitizen": "^3.1.1",
+    "commitizen": "^4.0.1",
     "cz-conventional-changelog": "^2.0.0",
     "danger": "9.0.3",
     "husky": "^3.0.0",