remove useless code

Author: Julien-Mialon

Parse/Internal/Push/Coder/ParsePushEncoder.cs

@@ -2,7 +2,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 
 namespace Parse.Internal {
   internal class ParsePushEncoder {
@@ -38,7 +37,7 @@ public IDictionary<string, object> Encode(IPushState state) {
         payload["expiration_interval"] = state.ExpirationInterval.Value.TotalSeconds;
       }
       if (state.PushTime.HasValue) {
-		    payload["push_time"] = state.PushTime.Value.ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ssZ");
+        payload["push_time"] = state.PushTime.Value.ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ssZ");
       }
 
       return payload;