Added bitio.

README.md

@@ -594,6 +594,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 * [autoflags](https://github.com/artyom/autoflags) - Go package to automatically define command line flags from struct fields.
 * [banner](https://github.com/dimiro1/banner) - Add beautiful banners into your Go applications.
 * [battery](https://github.com/distatus/battery) - A cross-platform, normalized battery information library.
+* [bitio](https://github.com/icza/bitio) - Highly optimized bit-level Reader and Writer for Go.
 * [browscap_go](https://github.com/digitalcrab/browscap_go) - GoLang Library for [Browser Capabilities Project](http://browscap.org/).
 * [datacounter](https://github.com/miolini/datacounter) - Go counters for readers/writer/http.ResponseWriter.
 * [go-chat-bot](https://github.com/go-chat-bot/bot) - IRC, Slack & Telegram bot written in Go.