Add network for withdrawals (DigitalRuby#846)

Author: v36u

src/ExchangeSharp/API/Exchanges/BinanceGroup/BinanceGroupCommon.cs

@@ -1145,6 +1145,11 @@ ExchangeWithdrawalRequest withdrawalRequest
 				payload["addressTag"] = withdrawalRequest.AddressTag;
 			}
 
+			if (!string.IsNullOrWhiteSpace(withdrawalRequest.Network))
+			{
+				payload["network"] = withdrawalRequest.Network;
+			}
+
 			JToken response = await MakeJsonRequestAsync<JToken>(
 					"/capital/withdraw/apply",
 					BaseUrlSApi,

src/ExchangeSharp/Model/ExchangeWithdrawalRequest.cs

@@ -50,8 +50,13 @@ public sealed class ExchangeWithdrawalRequest
 		/// </summary>
 		public SecureString Code { get; set; }
 
-		/// <summary>Returns a <see cref="System.String" /> that represents this instance.</summary>
-		/// <returns>A <see cref="System.String" /> that represents this instance.</returns>
+		/// <summary>
+		/// Network to use for the withdrawal
+		/// </summary>
+		public string Network { get; set; }
+
+		/// <summary>Returns a <see cref="string" /> that represents this instance.</summary>
+		/// <returns>A <see cref="string" /> that represents this instance.</returns>
 		public override string ToString()
 		{
 			// 2.75 ETH to 0x1234asdf