Remove Gmusic (#1939)

* Remove Gmusic 

https://play.google.com/music

* Remove link to Gmusic

README.md

@@ -119,7 +119,7 @@ The [2.4](https://github.com/MiczFlor/RPi-Jukebox-RFID/milestone/7?closed=1) rel
 * [Playout **Resume**](https://github.com/MiczFlor/RPi-Jukebox-RFID/wiki/MANUAL#manage-playout-behaviour) switch for audio books, allowing you to jump straight back to where you were (unless you fell asleep...).
 * Playout **Shuffle** switch to mix up your playlists.
 * Download from **YouTube** directly to your Phoniebox.
-* Support for **[Spotify](https://github.com/MiczFlor/RPi-Jukebox-RFID/wiki/Spotify-FAQ)** and **[Google Play Music](https://github.com/MiczFlor/RPi-Jukebox-RFID/wiki/Enable-Google-Play-Music-GMusic)** integration.
+* Support for **[Spotify](https://github.com/MiczFlor/RPi-Jukebox-RFID/wiki/Spotify-FAQ)** integration.
 * **Podcasts!** More for myself than anybody else, I guess, I added the [podcast feature for Phoniebox](https://github.com/MiczFlor/RPi-Jukebox-RFID/wiki/MANUAL#podcasts) (2018-05-09)
 * [Buttons](https://github.com/MiczFlor/RPi-Jukebox-RFID/wiki/Using-GPIO-hardware-buttons) and [knobs / dials](https://github.com/MiczFlor/RPi-Jukebox-RFID/wiki/Audio-RotaryKnobVolume) to control your **Phoniebox via GPIO**.