docs: remove beta words

Author: leo6104

README.md

@@ -29,7 +29,7 @@ In order to ensure that your end users always have a functioning version of your
 
 ## Supported Capacitor Platforms
 
-Tested with below environment
+Tested with these environment
 ```
 "@capacitor-community/http": "^1.0.0",
 "@capacitor/core": "^3.0.0",
@@ -38,8 +38,6 @@ Tested with below environment
 "@capacitor/filesystem": "^1.0.0"
 ```
 
-Capacitor v3 is still in beta. Until major update, this plugin can be unstable.
-
 ## Getting Started
 
 Once you've followed the general-purpose ["getting started"](https://docs.microsoft.com/en-us/appcenter/distribution/codepush/) instructions for setting up your CodePush account, you can start CodePush-ifying your Capacitor app by running the following command from within your app's root directory: