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

Closes #43

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
   "devDependencies": {
     "commitizen": "3.0.5",
     "coveralls": "3.0.1",
-    "cz-conventional-changelog": "2.1.0",
+    "cz-conventional-changelog": "3.1.1",
     "eslint": "4.19.1",
     "eslint-config-luanmuniz": "0.2.1",
     "eslint-plugin-import": "2.12.0",