Update Dependencies and support NS2.0 builds (#1046)

* Update deps, fix test warnings.

* Support ns2.0

* Fix typo

* Remove ns1.1 support

* Net.Http and Net.Websockets.Client are not needed in ns2.0

* Move to net46 per volt

* Remove ns1.3 constants

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

@@ -1,4 +1,3 @@
-#if DEFAULTUDPCLIENT
 using System;
 using System.Net;
 using System.Net.Sockets;
@@ -85,11 +84,7 @@ namespace Discord.Net.Udp
 
             if (_udp != null)
             {
-#if UDPDISPOSE
                 try { _udp.Dispose(); }
-#else
-                try { _udp.Close(); }
-#endif
                 catch { }
                 _udp = null;
             }
@@ -132,4 +127,3 @@ namespace Discord.Net.Udp
         }
     }
 }
-#endif