chore(deps): update commitlint monorepo to v18

Author: renovate[bot]

package.json

@@ -20,9 +20,9 @@
     "semantic-release": "semantic-release"
   },
   "devDependencies": {
-    "@commitlint/cli": "7.6.1",
-    "@commitlint/config-conventional": "7.6.0",
-    "@commitlint/travis-cli": "7.6.1",
+    "@commitlint/cli": "18.6.1",
+    "@commitlint/config-conventional": "18.6.2",
+    "@commitlint/travis-cli": "18.6.1",
     "@ember-decorators/babel-transforms": "5.2.0",
     "@ember/optional-features": "0.7.0",
     "@mike-works/js-lib-renovate-config": "2.0.0",