Replace Libresonic with Airsonic

Hi, I would like to replace Libresonic with Airsonic since we forked again more than a year ago. Reason why can be read [here](https://airsonic.github.io/#history), also Libresonic is dead since we forked.

README.md

@@ -826,6 +826,7 @@ See also <https://en.wikipedia.org/wiki/List_of_streaming_media_systems>, <https
 ### Audio Streaming
 
 - [Ampache](http://ampache.org/) - Web based audio/video streaming application. ([Demo](http://play.dogmazic.net/), [Source Code](https://github.com/ampache/ampache)) `AGPL-3.0` `PHP`
+- [Airsonic](https://airsonic.github.io/) - Open-source web-based media streamer and jukebox. A fork of Subsonic's last open-source release, before it switched licenses. `GPL-3.0` `Java`
 - [Beets](http://beets.io/) - Music library manager and MusicBrainz tagger (command-line and Web interface). ([Source Code](https://github.com/beetbox/beets)) `MIT` `Python`
 - [CherryMusic](http://www.fomori.org/cherrymusic/) - Minimalistic Web-Mediaplayer. ([Source Code](https://github.com/devsnd/cherrymusic)) `GPL-3.0` `Python`
 - [cloudtunes](https://github.com/jkbrzt/cloudtunes) `⚠` - Web-based music player for the cloud. `MIT` `Python`
@@ -836,7 +837,6 @@ See also <https://en.wikipedia.org/wiki/List_of_streaming_media_systems>, <https
 - [Groove Basin](https://github.com/andrewrk/groovebasin) - Music player server with a web-based user interface inspired by Amarok 1.4. `MIT` `Nodejs`
 - [Icecast 2](http://www.icecast.org/) - streaming audio/video server which can be used to create an Internet radio station or a privately running jukebox and many things in between. ([Source Code](https://git.xiph.org/?p=icecast-server.git;a=summary)) `GPL-2.0` `C`
 - [koel](http://koel.phanan.net/) - Personal music streaming server that works. ([Source Code](https://github.com/phanan/koel)) `MIT` `PHP`
-- [Libresonic](http://libresonic.org/) - Open-source web-based media streamer and jukebox. A fork of Subsonic's last open-source release, before it switched licenses. `GPL-3.0` `Java`
 - [LibreTime](http://libretime.org) - Simple, open source platform that lets you broadcast streaming radio on the web (fork of [Airtime](https://github.com/sourcefabric/Airtime)). ([Source Code](https://github.com/LibreTime/libretime)) `AGPL-3.0` `PHP`
 - [Mopidy](http://mopidy.readthedocs.org/) - Extensible music server. Offers a superset of the mpd API, as well as integration with 3rd party services like Spotify, SoundCloud etc. ([Source Code](https://github.com/mopidy/mopidy)) `Apache-2.0` `Python`
   - [Moped](https://github.com/martijnboland/moped) - Responsive HTML5 + Javascript client for the Mopidy music server. `MIT` `HTML5`