update list of subclass projects

Author: alexeyraspopov

README.md

@@ -54,4 +54,5 @@ React Coroutine attempts to use basic language features for the sake of solving
  * [react-transmit](https://github.com/RickWong/react-transmit)
  * [react-loadable](https://github.com/thejameskyle/react-loadable)
  * [react-controller](https://github.com/bradestey/react-controller)
+ * [react-async-component](https://github.com/ctrlplusb/react-async-component)
  * [smalldots](https://github.com/smalldots/smalldots)