chore(package): update commitizen to version 4.0.2

Closes #94

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "@commitlint/config-conventional": "^7.1.2",
     "JSONStream": "^1.3.5",
     "asset-pipe-test-es5a": "^1.0.0",
-    "commitizen": "^3.0.5",
+    "commitizen": "^4.0.2",
     "cz-conventional-changelog": "^2.1.0",
     "eslint": "^5.0.1",
     "eslint-config-finn": "^3.0.1",