chore(package): update commitizen to version 4.0.1

Closes #69

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "@types/jasminewd2": "^2.0.6",
     "@types/node": "~10.12.20",
     "codelyzer": "~5.0.0",
-    "commitizen": "^3.0.7",
+    "commitizen": "^4.0.1",
     "cpx": "^1.5.0",
     "cz-conventional-changelog": "^2.1.0",
     "husky": "^1.3.1",