Avoid isinstance
Add query params in get request
Use collections.Counter()
Remove Options.number
Counter and Queue utils
Player service
Metadata.service -> Metadata.backend
Rewrite spotify, begin testing
Pretty print JSON
Add ID metadata field
Spotify duration in seconds
Bare-bones template
Add TODO
Set up testing
Implement poller
Fetch player data from server
Delegate to player
Simplify JSON representation
Display history
Reset counter on error