Cleanup

src/Discord.Net.Core/Audio/IAudioClient.cs

@@ -1,5 +1,4 @@
 using System;
-using System.IO;
 using System.Threading.Tasks;
 
 namespace Discord.Audio

src/Discord.Net.Core/Extensions/GuildUserExtensions.cs

@@ -6,7 +6,6 @@ namespace Discord
 {
     public static class GuildUserExtensions
     {
-        //TODO: Should we remove Add/Remove? Encourages race conditions.
         public static Task AddRolesAsync(this IGuildUser user, params IRole[] roles)
             => ChangeRolesAsync(user, add: roles);
         public static Task AddRolesAsync(this IGuildUser user, IEnumerable<IRole> roles)

src/Discord.Net.Core/Utils/Preconditions.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Linq;
 
 namespace Discord
 {