chore(package): update cz-conventional-changelog to version 3.1.0

Closes #36

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "@types/ramda": "github:types/npm-ramda#dist",
     "ava": "^0.25.0",
     "concurrently": "^3.6.0",
-    "cz-conventional-changelog": "^2.1.0",
+    "cz-conventional-changelog": "^3.1.0",
     "nyc": "^12.0.2",
     "prettier": "^1.13.5",
     "semantic-release": "^15.6.0",