docs(CHANGELOG): specifically note v11.1.2 is for react-native 0.64+

Author: mikehardy

CHANGELOG.md

@@ -9,7 +9,7 @@ See [Conventional Commits](https://conventionalcommits.org) for commit guideline
 ### Bug Fixes
 
 * **database, types:** harmonize on/once/off types with firebase-js-sdk ([fbc06ca](https://github.com/invertase/react-native-firebase/commit/fbc06cac888e13071c5f87c652aeff40c3b27412)), closes [#5027](https://github.com/invertase/react-native-firebase/issues/5027)
-* **listeners:** port Emitter.once to analogous addListener/remove API ([5eb2f59](https://github.com/invertase/react-native-firebase/commit/5eb2f599e93ccecd91c800018959f9dc370f1e24))
+* **listeners:** port Emitter.once to analogous addListener/remove API (required for react-native 0.64) ([5eb2f59](https://github.com/invertase/react-native-firebase/commit/5eb2f599e93ccecd91c800018959f9dc370f1e24))