Update install step in README to install specific beta

Since NPM doesn't automatically recognize the latest beta (with `beta` tag) as the `latest`, we should clarify the install step should specify which beta version to use.
OneSignal · Oct 26, 2021 · 88cdeda · 88cdeda
1 parent 055986e
commit 88cdeda
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -22,7 +22,7 @@
 ## Install
 
 ```sh
-expo install onesignal-expo-plugin
+expo install onesignal-expo-plugin@1.0.0-beta3
 ```
 
 **Note:** this does not install the [OneSignal SDK](https://github.com/OneSignal/react-native-onesignal).