Update README.md

- add library tiering

Author: alanjcharles

README.md

@@ -1,4 +1,8 @@
-# @segment/analytics-react-native
+# @segment/analytics-react-native'
+
+### 🎉 Flagship 🎉
+This library is one of Segment’s most popular Flagship libraries. It is actively maintained by Segment, benefitting from new feature releases and ongoing support.
+
 
 The hassle-free way to add Segment analytics to your React-Native app.
 
@@ -753,4 +757,4 @@ Before contributing, please also see our [code of conduct](CODE_OF_CONDUCT.md).
 MIT
 
 [circleci-image]: https://circleci.com/gh/segmentio/analytics-react-native.svg?style=shield&circle-token=c08ac0da003f36b2a8901be421a6998124e1d352
-[circleci-url]: https://app.circleci.com/pipelines/github/segmentio/analytics-react-native
+[circleci-url]: https://app.circleci.com/pipelines/github/segmentio/analytics-react-native