fix mocked classes that weren't updated

test/Discord.Net.Tests.Unit/MockedEntities/MockedDMChannel.cs

@@ -83,7 +83,7 @@ namespace Discord
             throw new NotImplementedException();
         }
 
-        public Task<IUserMessage> SendMessageAsync(string text = null, bool isTTS = false, Embed embed = null, AllowedMentions allowedMentions = null, RequestOptions options = null)
+        public Task<IUserMessage> SendMessageAsync(string text = null, bool isTTS = false, Embed embed = null, RequestOptions options = null, AllowedMentions allowedMentions = null)
         {
             throw new NotImplementedException();
         }

test/Discord.Net.Tests.Unit/MockedEntities/MockedGroupChannel.cs

@@ -91,7 +91,7 @@ namespace Discord
             throw new NotImplementedException();
         }
 
-        public Task<IUserMessage> SendMessageAsync(string text = null, bool isTTS = false, Embed embed = null, AllowedMentions allowedMentions = null, RequestOptions options = null)
+        public Task<IUserMessage> SendMessageAsync(string text = null, bool isTTS = false, Embed embed = null, RequestOptions options = null, AllowedMentions allowedMentions = null)
         {
             throw new NotImplementedException();
         }

test/Discord.Net.Tests.Unit/MockedEntities/MockedTextChannel.cs

@@ -177,7 +177,7 @@ namespace Discord
             throw new NotImplementedException();
         }
 
-        public Task<IUserMessage> SendMessageAsync(string text = null, bool isTTS = false, Embed embed = null, AllowedMentions allowedMentions = null, RequestOptions options = null)
+        public Task<IUserMessage> SendMessageAsync(string text = null, bool isTTS = false, Embed embed = null, RequestOptions options = null, AllowedMentions allowedMentions = null)
         {
             throw new NotImplementedException();
         }