chore(package): upgrade @commitlint to 6

Author: SimenB

package.json

@@ -21,15 +21,15 @@
     "commitmsg": "commitlint -e $GIT_PARAMS"
   },
   "devDependencies": {
-    "@commitlint/cli": "^5.2.0",
+    "@commitlint/cli": "^6.0.1",
     "@commitlint/config-conventional": "^5.1.3",
     "eslint": "^4.10.0",
     "eslint-config-prettier": "^2.7.0",
     "eslint-plugin-prettier": "^2.3.1",
     "husky": "^0.14.3",
     "jest": "^22.0.4",
     "lint-staged": "^6.0.0",
-    "prettier": "^1.8.1",
+    "prettier": "^1.10.2",
     "semantic-release": "^11.0.2"
   },
   "prettier": {