Added rodio audio library (#354)

* Update README.md

* Update README.md

* Update README.md

README.md

@@ -370,6 +370,7 @@ See also [Are we (I)DE yet?](https://areweideyet.com/) and [Rust and IDEs](https
 * [jpernst/alto](https://github.com/jpernst/alto) — [OpenAL 1.1](http://www.openal.org/) bindings [<img src="https://api.travis-ci.org/jpernst/alto.svg?branch=master">](https://travis-ci.org/jpernst/alto)
 * [musitdev/portmidi-rs](https://github.com/musitdev/portmidi-rs) — [PortMidi](http://portmedia.sourceforge.net/portmidi/) bindings [<img src="https://api.travis-ci.org/musitdev/portmidi-rs.svg?branch=master">](https://travis-ci.org/musitdev/portmidi-rs)
 * [ruuda/hound](https://github.com/ruuda/hound) [[Hound](https://crates.io/crates/hound)] — A WAV encoding and decoding library [<img src="https://api.travis-ci.org/ruuda/hound.svg?branch=master">](https://travis-ci.org/ruuda/hound)
+* [tomaka/rodio](https://github.com/tomaka/rodio) - A Rust audio playback library [![Build Status](https://travis-ci.org/tomaka/rodio.svg?branch=master)](https://travis-ci.org/tomaka/rodio)
 * [RustAudio](https://github.com/RustAudio)
   * [RustAudio/rust-portaudio](https://github.com/RustAudio/rust-portaudio) — [PortAudio](http://www.portaudio.com/) bindings [<img src="https://api.travis-ci.org/RustAudio/rust-portaudio.svg?branch=master">](https://travis-ci.org/RustAudio/rust-portaudio)