chore(package): update commitizen to version 4.0.3

Closes #491

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "chai-as-promised": "^7.1.1",
     "chai-string": "^1.2.0",
     "codeclimate-test-reporter": "^0.5.0",
-    "commitizen": "^3.0.0",
+    "commitizen": "^4.0.3",
     "cz-conventional-changelog": "^2.0.0",
     "eslint": "^5.0.0",
     "glob": "^7.1.1",