chore(package): update commitizen to version 4.1.2

Closes #25

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "@types/jest": "^25.1.3",
     "@types/node": "^13.1.0",
-    "commitizen": "^3.0.7",
+    "commitizen": "^4.1.2",
     "cz-conventional-changelog": "^2.1.0",
     "execa": "^4.0.0",
     "jest": "^25.1.0",