Update README.md

Author: thomasnield

README.md

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 # RxJavaFX: JavaFX bindings for RxJava
 
 Read the free eBook [_Learning RxJava with JavaFX_](https://www.gitbook.com/book/thomasnield/rxjavafx-guide/details) to get started!
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 RxJavaFX is a lightweight library to convert JavaFX events into [RxJava](https://github.com/ReactiveX/RxJava) Observables/Flowables and vice versa. It also has a `Scheduler` to safely move emissions to the JavaFX Event Dispatch Thread. 
 
 **NOTE**: To use with [Kotlin](http://kotlinlang.org/), check out [RxKotlinFX](https://github.com/thomasnield/RxKotlinFX) to leverage this library with extension functions and additional operators.