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

Closes #63

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "babel-preset-es2015": "^6.24.1",
     "babelify": "^8.0.0",
     "commitizen": "^3.0.5",
-    "cz-conventional-changelog": "^2.1.0",
+    "cz-conventional-changelog": "^3.1.0",
     "eslint": "^5.0.0",
     "eslint-config-finn": "^3.0.1",
     "eslint-config-finn-prettier": "^3.0.2",