Update README.md

Author: andrei-m-code

README.md

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 # CorePush - .NET Core Android Firebase (FCM) and Apple iOS JWT HTTP/2 Push notifications (APN)
-Simple .NET Core library for sending Push Notifications for Android Firebase (FCM) and iOS (APN) with JWT HTTP/2 API. **Important**: requires .NET Core 3.1.
+Simple .NET Core library for sending Push Notifications for Android Firebase (FCM) and iOS (APN) with JWT HTTP/2 API. **Important**: requires .NET Core 3.1. The library has no 3rd-party dependencies. Very lightweight.
 
 ## Installation