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 learn how to get started].
+Read the free eBook [_Learning RxJava with JavaFX_](https://www.gitbook.com/book/thomasnield/rxjavafx-guide/details) to get started!
 
 Learn more about RxJava on the <a href="https://github.com/ReactiveX/RxJava/wiki">Wiki Home</a> and the <a href="http://techblog.netflix.com/2013/02/rxjava-netflix-api.html">Netflix TechBlog post</a> where RxJava was introduced.