docs(): add beta tags

src/plugins/rollbar.ts

@@ -1,6 +1,7 @@
 import { Plugin, Cordova } from './plugin';
 
 /**
+ * @beta
  * @name Rollbar
  * @description
  * This plugin adds Rollbar App monitoring to your application

src/plugins/speech-recognition.ts

@@ -43,6 +43,7 @@ export interface SpeechRecognitionListeningOptionsAndroid {
 }
 
 /**
+ * @beta
  * @name SpeechRecognition
  * @description
  * This plugin does speech recognition using cloud services

src/plugins/stripe.ts

@@ -52,6 +52,7 @@ export interface StripeCardTokenParams {
 }
 
 /**
+ * @beta
  * @name Stripe
  * @description
  * A plugin that allows you to use Stripe's Native SDKs for Android and iOS.