Fixed some resharper warnings

CryptoExchange.Net/Objects/ApiProxy.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace CryptoExchange.Net
+namespace CryptoExchange.Net.Objects
 {
     public class ApiProxy
     {

CryptoExchange.Net/Objects/CallResult.cs

@@ -1,4 +1,4 @@
-namespace CryptoExchange.Net
+namespace CryptoExchange.Net.Objects
 {
     public class CallResult<T>
     {

CryptoExchange.Net/Objects/Error.cs

@@ -1,4 +1,4 @@
-namespace CryptoExchange.Net
+namespace CryptoExchange.Net.Objects
 {
     public abstract class Error
     {

CryptoExchange.Net/Objects/ExchangeOptions.cs

@@ -2,10 +2,9 @@
 using System.IO;
 using CryptoExchange.Net.Authentication;
 using CryptoExchange.Net.Logging;
-using CryptoExchange.Net.Objects;
 using CryptoExchange.Net.RateLimiter;
 
-namespace CryptoExchange.Net
+namespace CryptoExchange.Net.Objects
 {
     /// <summary>
     /// Options