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

Closes #70

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "codelyzer": "~5.0.0",
     "commitizen": "^3.0.7",
     "cpx": "^1.5.0",
-    "cz-conventional-changelog": "^2.1.0",
+    "cz-conventional-changelog": "^3.1.1",
     "husky": "^1.3.1",
     "jasmine-core": "~3.4.0",
     "jasmine-spec-reporter": "~4.2.1",