message: Fix Discord link in `README.md`
diff: @@ -214,7 +214,7 @@ The development of iced is sponsored by the [Cryptowatch] team at [Kraken.com]
  [The Elm Architecture]: https://guide.elm-lang.org/architecture/
  [the current issues]: https://github.com/hecrj/iced/issues
  [contributing guidelines]: https://github.com/hecrj/iced/blob/master/CONTRIBUTING.md
  -Iced [Discord server]: https://discord.gg/3xZJ65GAhd
  +[Discord server]: https://discord.gg/3xZJ65GAhd
  [Rust Community Discord]: https://bit.ly/rust-community
  [Cryptowatch]: https://cryptowat.ch/charts
  [Kraken.com]: https://kraken.com/
  