v0.2.0

Brief description of major changes

• librespot integration (first iteration):
  • #2 using librespot for authentication
  • #3 using librespot for streaming support with an integrated Spotify client
• Fix several deadlock bugs post librespot integration
• Github actions:
  • remove cargo-audit Github action (TODO: added back when rspotify releases a new version)
  • use Google's distroless for deploying a docker binary image of latest master branch build
  • improve Rust GitHub action script
• Improve code documentation and application documentation