Documentation Update Needed: React Native Upgrade to v12 Requires react-native-url-polyfill

[SimbaNetropolix]

Hi everyone,

When upgrading from an earlier PubNub version (v10 in my case) to v12, I encountered a peer dependency error during the build process related to react-native-url-polyfill.

To help other React Native developers avoid this issue, I would recommend updating the documentation to include the required installation command:

npm install pubnub react-native-url-polyfill

Including this dependency in the upgrade or installation instructions would make the migration process smoother and help prevent build-time errors.

Thank you.

[royalknight71]

Hi, I'd like to help with this documentation update! Can I proceed with a PR for this?