Improve README description

Author: Luni-4

README.md

@@ -1,11 +1,11 @@
-# WAV demuxer and muxer
+# WAV muxer and demuxer
 
 [![LICENSE](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Actions Status](https://github.com/rust-av/wav/workflows/wav/badge.svg)](https://github.com/rust-av/wav/actions)
 [![dependency status](https://deps.rs/repo/github/rust-av/wav/status.svg)](https://deps.rs/repo/github/rust-av/wav)
 [![IRC](https://img.shields.io/badge/irc-%23rust--av-blue.svg)](http://webchat.freenode.net?channels=%23rust-av&uio=d4)
 
-Pure-rust implementation of a WAV demuxer and muxer.
+Pure-rust implementation of a WAV muxer and demuxer.
 
 ## Build