Added missing IDisposables

src/Discord.Net.Rest/Net/DefaultRestClient.cs

@@ -12,7 +12,7 @@ using System.Threading.Tasks;
 
 namespace Discord.Net.Rest
 {
-    internal sealed class DefaultRestClient : IRestClient
+    internal sealed class DefaultRestClient : IRestClient, IDisposable
     {
         private const int HR_SECURECHANNELFAILED = -2146233079;
 

src/Discord.Net.WebSocket/Net/DefaultUdpSocket.cs

@@ -7,7 +7,7 @@ using System.Threading.Tasks;
 
 namespace Discord.Net.Udp
 {
-    internal class DefaultUdpSocket : IUdpSocket
+    internal class DefaultUdpSocket : IUdpSocket, IDisposable
     {
         public event Func<byte[], int, int, Task> ReceivedDatagram;
 

src/Discord.Net.WebSocket/Net/DefaultWebSocketClient.cs

@@ -10,7 +10,7 @@ using System.Threading.Tasks;
 
 namespace Discord.Net.WebSockets
 {
-    internal class DefaultWebSocketClient : IWebSocketClient
+    internal class DefaultWebSocketClient : IWebSocketClient, IDisposable
     {
         public const int ReceiveChunkSize = 16 * 1024; //16KB
         public const int SendChunkSize = 4 * 1024; //4KB