Enable Renovate auto-merge for dependency updates

Author: compscidr

renovate.json

@@ -2,5 +2,8 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:recommended"
-  ]
+  ],
+  "automerge": true,
+  "automergeType": "pr",
+  "platformAutomerge": true
 }