Update README.md

Author: andrei-m-code

README.md

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 # .NET Core Push Notifications for Web, Android and iOS
 Send notifications to:
 - ✅ iOS - Apple Push Notifications (APN)
-- ✅ Android - via Firebase Cloud Messaging
-- ✅ Web - via Cloud Messaging
+- ✅ Android - via Firebase Cloud Messaging (FCM)
+- ✅ Web - via Firebase Cloud Messaging (FCM)
 
 CorePush is a lightweight library with minimal overhead. Send notifications to Android and Web using Firebase Cloud Messaging and iOS APN with JWT HTTP/2 API.