chore(package): update commitlint to version 8.3.4

Closes #22

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "babel-core": "^7.0.0-bridge.0",
     "babel-eslint": "^10.0.1",
     "babel-jest": "^23.6.0",
-    "commitlint": "^7.2.1",
+    "commitlint": "^8.3.4",
     "eslint": "^5.7.0",
     "eslint-config-prettier": "^3.1.0",
     "eslint-config-problems": "^2.0.0",