chore(deps): update commitlint monorepo to v20

Author: renovate[bot]

package.json

@@ -11,9 +11,9 @@
     "semantic-release": "semantic-release"
   },
   "devDependencies": {
-    "@commitlint/cli": "^7.2.1",
-    "@commitlint/config-conventional": "^7.1.2",
-    "@commitlint/travis-cli": "^7.2.1",
+    "@commitlint/cli": "^20.0.0",
+    "@commitlint/config-conventional": "^20.0.0",
+    "@commitlint/travis-cli": "^20.0.0",
     "husky": "^1.1.3",
     "semantic-release": "^15.10.8",
     "travis-deploy-once": "^5.0.9"