fix(deps): update dependency cz-conventional-changelog to v2.1.0 (#503)

Author: renovate[bot]

package-lock.json

@@ -75,7 +75,7 @@
   "dependencies": {
     "cachedir": "^1.1.0",
     "chalk": "1.1.3",
-    "cz-conventional-changelog": "2.0.0",
+    "cz-conventional-changelog": "2.1.0",
     "dedent": "0.6.0",
     "detect-indent": "4.0.0",
     "find-node-modules": "1.0.4",