Update docs to match rfc7700 stuff

CHANGELOG.md

 ### Added
 
 ### Changed
+* Casemapping changed from custom unicode mapping to preliminary [rfc7700](https://github.com/ircv3/ircv3-specifications/pull/272) mapping.
 
 ### Removed
 

README.md

 
 ## Features
 
-* UTF-8 nick and channel names
+* UTF-8 nick and channel names with rfc7700
 * [yaml](http://yaml.org/) configuration
 * native TLS/SSL support
 * server password (`PASS` command)