Update README.md

Author: benjchristensen

README.md

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 # RxJava: Reactive Extensions for the JVM
 
-RxJava is a Java VM implementation of [Reactive Extensions](://reactivex.io): a library for composing asynchronous and event-based programs by using observable sequences.
+RxJava is a Java VM implementation of [Reactive Extensions](http://reactivex.io): a library for composing asynchronous and event-based programs by using observable sequences.
 
 It extends the [observer pattern](http://en.wikipedia.org/wiki/Observer_pattern) to support sequences of data/events and adds operators that allow you to compose sequences together declaratively while abstracting away concerns about things like low-level threading, synchronization, thread-safety and concurrent data structures.