Merge pull request #437 from KnisterPeter/greenkeeper/cz-conventional-changelog-2.1.0

Update cz-conventional-changelog to the latest version 🚀

Author: KnisterPeter

package.json

@@ -49,7 +49,7 @@
     "chokidar-cli": "^1.2.0",
     "conventional-changelog-cli": "1.3.4",
     "coveralls": "^3.0.0",
-    "cz-conventional-changelog": "2.0.0",
+    "cz-conventional-changelog": "2.1.0",
     "diff": "3.4.0",
     "nyc": "11.2.1",
     "react": "^16.0.0",