NadekoBot.Extensions should now be fully annotated with nullable reference types as well as many classes from NadekoBot.Common

src/NadekoBot/Common/Attributes/NadekoCommand.cs

@@ -1,4 +1,4 @@
-using System.Runtime.CompilerServices;
+using System.Runtime.CompilerServices;
 
 namespace NadekoBot.Common.Attributes;
 
@@ -10,4 +10,4 @@ public sealed class NadekoCommandAttribute : CommandAttribute
         => this.MethodName = memberName.ToLowerInvariant();
 
     public string MethodName { get; }
-}
+}