Cleaned up virtual methods

src/Discord.Net.Rest/Entities/Channels/RestGroupChannel.cs

@@ -41,7 +41,7 @@ namespace Discord.Rest
             if (model.Recipients.IsSpecified)
                 UpdateUsers(model.Recipients.Value);
         }
-        internal virtual void UpdateUsers(API.User[] models)
+        internal void UpdateUsers(API.User[] models)
         {
             var users = ImmutableDictionary.CreateBuilder<ulong, RestGroupUser>();
             for (int i = 0; i < models.Length; i++)

src/Discord.Net.WebSocket/Audio/AudioClient.cs

@@ -300,7 +300,7 @@ namespace Discord.Audio
             catch (OperationCanceledException) { }
         }
 
-        internal virtual void Dispose(bool disposing)
+        internal void Dispose(bool disposing)
         {
             if (!_isDisposed)
                 _isDisposed = true;

src/Discord.Net.WebSocket/Entities/Channels/SocketGroupChannel.cs

@@ -53,7 +53,7 @@ namespace Discord.WebSocket
             if (model.Recipients.IsSpecified)
                 UpdateUsers(state, model.Recipients.Value);
         }
-        internal virtual void UpdateUsers(ClientState state, UserModel[] models)
+        private void UpdateUsers(ClientState state, UserModel[] models)
         {
             var users = new ConcurrentDictionary<ulong, SocketGroupUser>(ConcurrentHashSet.DefaultConcurrencyLevel, (int)(models.Length * 1.05));
             for (int i = 0; i < models.Length; i++)