Pootis-Bot Version 1.2.0

Pootis-Bot Version 1.2.0

Basic maintenance update. Now uses Discord's v9 API.
I am hoping this will be the last v1.x release.

Changelog

• Update to Discord.Net 3.x
• Update other packages
  • Microsoft.Extensions.DependencyInjection
  • Serilog.Sinks.Async
  • Serilog.Sinks.Console
  • Serilog.Sinks.File
  • SteamWebAPI2
  • Wiki.Net
  • YoutubeExplode
• Bump copyright