Update README.md (#424)

Updated verbiage in readme to reflect Beta status.

Author: tlalfano

README.md

@@ -2,7 +2,7 @@
 
 The hassle-free way to add Segment analytics to your React-Native app.
 
-NOTE: This project is currently in development and is covered by Segment's [First Access & Beta Preview Terms](https://segment.com/legal/first-access-beta-preview/). We encourage you to try out this new library. Please provide feedback via Github issues/PRs, and feel free to submit pull requests. Customers should not use this library for production applications during our development and Pilot phases.
+NOTE: This project is currently in development and is covered by Segment's [First Access & Beta Preview Terms](https://segment.com/legal/first-access-beta-preview/). We encourage you to try out this new library. Please provide feedback via Github issues/PRs, and feel free to submit pull requests. Customers should not use this library for production applications during our Pilot and Beta phases.
 
 ⚠️ This readme covers `analytics-react-native 2.0.0` and greater. The code and readme for `analytics-react-native` versions below `2.0.0` can be found on the `analytics-react-native-v1` branch.