v1.1.0

1.1.0

• Upgraded to Go 1.20
• Refactored valid domains to be configurable
• Updated environment variables to need prefix SHOWTUNES_
• Refactored /v1/color endpoint to return response { "color": "<hex string>" }
• Refactored refresh token from PUT request to POST request on same endpoint as authorization token
  • Matches Spotify's own token API endpoint request
  • Added grant_type to determine between authorization_token or refresh_token
  • Renamed endpoint from v1/auth/tokens to v1/auth/token
• Added more detail to README for endpoints and configurations