New Features
==========
- Add new action to change to **previous track** (see 13)
- Add action to change to **next track** (see 13)
- Add new GPIO handlers for **previous track** and **next track**
- Tags can now be **unregistered**
Changes
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- The GPIO pin number for the `play/pause` button changed (see the [project README](README.rstconnecting-the-buttons-optional))