chore(package): update commitizen to version 4.0.0

Closes #524

Author: greenkeeper[bot]

package.json

@@ -142,7 +142,7 @@
     "babel-plugin-react-intl": "2.4.0",
     "babel-plugin-styled-components": "1.10.2",
     "babel-plugin-transform-inline-environment-variables": "^0.4.3",
-    "commitizen": "3.0.7",
+    "commitizen": "4.0.0",
     "coveralls": "3.0.3",
     "cross-env": "^5.0.5",
     "cypress": "^3.0.2",