chore(package): update commitizen to version 4.0.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "@semantic-release/release-notes-generator": "^7.1.4",
     "broccoli-asset-rev": "^3.0.0",
     "bulma": "^0.7.4",
-    "commitizen": "^3.0.7",
+    "commitizen": "^4.0.1",
     "cz-conventional-changelog": "^2.1.0",
     "ember-cli": "^3.8.1",
     "ember-cli-code-coverage": "^1.0.0-beta.8",