Add RFC Mention in README

Author: TomGranot

README.md

@@ -7,6 +7,10 @@ The library also supports the WebSocket Protocol.
 
 It's built on top of [Netty](https://github.com/netty/netty). It's currently compiled on Java 8 but runs on Java 9 too.
 
+## New Roadmap RFCs!
+
+Well, not really RFCs, but as [I](https://github.com/TomGranot) am ramping up to release a new version, I would appreciate the comments from the community. Please add an issue and [label it RFC](https://github.com/AsyncHttpClient/async-http-client/labels/RFC) and I'll take a look! 
+
 ## This Repository is Actively Maintained
 
 [@TomGranot](https://github.com/TomGranot) is the current maintainer of this repository. You should feel free to reach out to him in an issue here or on [Twitter](https://twitter.com/TomGranot) for anything regarding this repository.