chore(package): update cz-conventional-changelog to version 3.1.1

Closes #57

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "brfs": "^2.0.0",
     "chai": "^4.1.2",
     "commitlint-config-traverson": "^1.0.12",
-    "cz-conventional-changelog": "^2.1.0",
+    "cz-conventional-changelog": "^3.1.1",
     "express": "^4.16.2",
     "grunt": "^1.0.4",
     "grunt-browserify": "^5.2.0",