docs: update tested player list in README (#305)

- Sublime music: update link as it has moved to GitHub
- Add Strawberry music player (Clementine fork) for QT and KDE desktops
- Add Ultrasonic Android app

README.md

@@ -28,7 +28,9 @@
 - 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 [symfonium](https://symfonium.app), [dsub](https://f-droid.org/en/packages/github.daneren2005.dsub/), [jamstash](http://jamstash.com/), [sublime music](https://gitlab.com/sublime-music/sublime-music/), [soundwaves](https://apps.apple.com/us/app/soundwaves/id736139596), and [stmp](https://github.com/wildeyedskies/stmp)
+- tested on [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)
 
 ## installation