Few updates

[joshghent]

Great project! Thanks for this! Works like a dream 👍

I've added a few changes, listed below:

• Added a new SLACK_EMOJI config option to change the slack emoji
• Changed the default emoji to 🎵
• Updated the README with clearer setup instructions
• Added emoji detection. e.g., if the song or artist name contains "leaves" it will use the 🍃 emoji in the slack status (occasionally gives some false positives but we can improve on this)
• Added auto restart functionality if the last.fm api fails
• Check if the track is playing before updating the status. If the track is not playing then we will update the status saying that nothing is playing.

[joshghent]

Added auto restart functionality. If you've got a moment, it would be great to get this merged in. If you have no interest in the project anymore (understandable, I've got a graveyard of personal projects myself), then I am happy to take over ownership of it 👍

[joshghent]

Added docker support 👍

[owenvoke]

I'd say that Docker support would make more sense in a separate PR.

[joshghent]

@owenvoke ok