fix: util polyfill not needed

Ref: https://github.com/libp2p/js-libp2p-mplex/pull/213#issuecomment-1243219007

CHANGELOG.md

@@ -13,6 +13,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - API Docs moved to https://js.waku.org/
 - test: fix typing for nwaku JSON RPC responses.
 
+### Fixed
+
+- Specify that `util` polyfill is not needed so that bundlers can automatically discard it.
+
 ## [0.26.0] - 2022-09-08
 
 ### Added

package.json

@@ -83,7 +83,8 @@
     "reset-hard": "git clean -dfx -e .idea && git reset --hard && npm i && npm run build"
   },
   "browser": {
-    "crypto": false
+    "crypto": false,
+    "util": false
   },
   "engines": {
     "node": ">=16"