message: migrate to rust-2021
diff: @@ -11,7 +11,7 @@ description = "Spotify API wrapper"
  homepage = "https://github.com/ramsayleung/rspotify"
  repository = "https://github.com/ramsayleung/rspotify"
  keywords = ["spotify", "api"]
  -edition = "2018"
  +edition = "2021"
  [workspace]
  members = [
  