chore(package): update commitizen to version 4.1.1

Closes #219

Author: greenkeeper[bot]

package.json

@@ -69,7 +69,7 @@
     "babel-preset-stage-0": "6.24.1",
     "babel-register": "6.26.0",
     "codecov": "3.0.1",
-    "commitizen": "2.10.1",
+    "commitizen": "4.1.1",
     "cz-conventional-changelog": "2.1.0",
     "dont-break": "1.13.4",
     "eslint": "4.19.1",