chore(package): update cz-conventional-changelog to version 2.1.0 (#944)

Author: greenkeeper[bot]

package.json

@@ -66,7 +66,7 @@
     "babel-preset-flow": "^6.23.0",
     "chdir": "0.0.0",
     "coveralls": "^3.0.0",
-    "cz-conventional-changelog": "2.0.0",
+    "cz-conventional-changelog": "2.1.0",
     "documentation-schema": "0.0.1",
     "eslint": "^4.7.2",
     "eslint-config-prettier": "^2.6.0",