chore(deps): update @commitlint to v20

Author: renovate[bot]

package.json

@@ -57,9 +57,9 @@
     "tslib": "^1.10.0"
   },
   "devDependencies": {
-    "@commitlint/cli": "^8.1.0",
-    "@commitlint/config-conventional": "^8.1.0",
-    "@commitlint/prompt-cli": "^8.1.0",
+    "@commitlint/cli": "^20.0.0",
+    "@commitlint/config-conventional": "^20.0.0",
+    "@commitlint/prompt-cli": "^20.0.0",
     "@types/jest": "^25.2.1",
     "@types/node": "8.10.40",
     "aws-sdk": "^2.401.0",