chore(deps): update commitlint monorepo to v8

Author: renovate-bot

package.json

@@ -53,8 +53,8 @@
     "semantic-release": "semantic-release"
   },
   "devDependencies": {
-    "@commitlint/cli": "7.2.1",
-    "@commitlint/config-conventional": "7.1.2",
+    "@commitlint/cli": "8.0.0",
+    "@commitlint/config-conventional": "8.0.0",
     "@types/execa": "0.9.0",
     "@types/mocha": "5.2.6",
     "@types/mz": "0.0.32",