Fixed errors caused by #321

src/Discord.Net.Rest/Entities/Messages/RestMessage.cs

@@ -60,6 +60,8 @@ namespace Discord.Rest
             var model = await Discord.ApiClient.GetChannelMessageAsync(Channel.Id, Id, options).ConfigureAwait(false);
             Update(model);
         }
+        public Task DeleteAsync(RequestOptions options)
+            => MessageHelper.DeleteAsync(this, Discord, options);
 
         public override string ToString() => Content;