chore: Mark as serverless v3 compatible

Author: medikoo

package.json

@@ -67,7 +67,7 @@
     "lodash": "^4.17.21"
   },
   "peerDependencies": {
-    "serverless": "2",
+    "serverless": "2 || 3",
     "typescript": ">=2.2.2"
   },
   "jest": {