remove outdated description

Author: gengjiawen

README.md

@@ -1,4 +1,4 @@
-## Android Docker Image for react native (Experimental)
+## Android Docker Image for react native
 [![CircleCI](https://circleci.com/gh/react-native-community/docker-android.svg?style=svg)](https://circleci.com/gh/react-native-community/docker-android)
 [![Docker Pulls](https://img.shields.io/docker/pulls/reactnativecommunity/react-native-android.svg?maxAge=3600)](https://hub.docker.com/r/reactnativecommunity/react-native-android) 
 [![Docker Layers](https://images.microbadger.com/badges/image/reactnativecommunity/react-native-android.svg)](https://hub.docker.com/r/reactnativecommunity/react-native-android)
@@ -12,6 +12,4 @@ https://github.com/react-native-community/ci-sample
 ## Dockerhub Image
 see https://hub.docker.com/r/reactnativecommunity/react-native-android/
 
-Name may change later, see https://github.com/react-native-community/docker-android/issues/7.
-
 Original version is split from react-native repo, see https://github.com/facebook/react-native/blob/988366a4179d87d667e5d9396efdfba4cbbe0b2e/ContainerShip/Dockerfile.android-base.