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

src/NadekoBot/Common/Yml/CommentsObjectGraphVisitor.cs

@@ -1,4 +1,5 @@
-using YamlDotNet.Core;
+#nullable disable
+using YamlDotNet.Core;
 using YamlDotNet.Core.Events;
 using YamlDotNet.Serialization;
 using YamlDotNet.Serialization.ObjectGraphVisitors;
@@ -22,4 +23,4 @@ public class CommentsObjectGraphVisitor : ChainedObjectGraphVisitor
 
         return base.EnterMapping(key, value, context);
     }
-}
+}