build(dep): upgrade cz-c-c@2.1

Author: jgranstrom

package.json

@@ -42,7 +42,7 @@
     "babel-preset-es2015": "^6.22.0",
     "chai": "^4.1.2",
     "chai-subset": "^1.6.0",
-    "cz-conventional-changelog": "^1.2.0",
+    "cz-conventional-changelog": "^2.1.0",
     "foundation-sites": "^6.4.3",
     "mocha": "^4.0.1"
   },