Update README.md

Author: botatoes

README.md

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+UPDATE: Over the next few months, we will be working on a new version of CodePush that will address some of the most common performance issues our customers are facing. This updated version will allow a better experience, our team to better support CodePush moving forward and have a faster development cycle for new features. 
+We are prioritizing this work because we believe this to be the most valuable thing we can do for our CodePush customers in the long run. Starting June 11th 2019, support will slow down, bug fixes will be limited to critical bugs, and new feature development will pause until we finish this core update.
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 [![appcenterbanner](https://user-images.githubusercontent.com/31293287/32969262-3cc5d48a-cb99-11e7-91bf-fa57c67a371c.png)](http://microsoft.github.io/code-push/)
 
 # React Native Module for CodePush