mention subsonic.el in readme

README.md

@@ -30,9 +30,7 @@
 - support for the [album-artist](https://mkoby.com/2007/02/18/artist-versus-album-artist/) tag, to not clutter your artist list with compilation album appearances
 - written in [go](https://golang.org/), so lightweight and suitable for a raspberry pi, etc. (see ARM images below)
 - newer salt and token auth
-- tested on [airsonic-refix](https://github.com/tamland/airsonic-refix), [symfonium](https://symfonium.app), [dsub](https://f-droid.org/en/packages/github.daneren2005.dsub/), [jamstash](http://jamstash.com/),
-  [sublime music](https://github.com/sublime-music/sublime-music), [soundwaves](https://apps.apple.com/us/app/soundwaves/id736139596),
-  [stmp](https://github.com/wildeyedskies/stmp), [strawberry](https://www.strawberrymusicplayer.org/), and [ultrasonic](https://gitlab.com/ultrasonic/ultrasonic)
+- tested on [airsonic-refix](https://github.com/tamland/airsonic-refix), [symfonium](https://symfonium.app), [dsub](https://f-droid.org/en/packages/github.daneren2005.dsub/), [jamstash](http://jamstash.com/), [subsonic.el](https://git.sr.ht/~amk/subsonic.el), [sublime music](https://github.com/sublime-music/sublime-music), [soundwaves](https://apps.apple.com/us/app/soundwaves/id736139596), [stmp](https://github.com/wildeyedskies/stmp), [strawberry](https://www.strawberrymusicplayer.org/), and [ultrasonic](https://gitlab.com/ultrasonic/ultrasonic)
 
 ## installation