Feature/ratelimit refactor (#197)

CryptoExchange.Net/RateLimiting/RateLimitItemType.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace CryptoExchange.Net.RateLimiting
+{
+    /// <summary>
+    /// Rate limit item type
+    /// </summary>
+    [Flags]
+    public enum RateLimitItemType
+    {
+        /// <summary>
+        /// A connection attempt
+        /// </summary>
+        Connection = 1,
+        /// <summary>
+        /// A request
+        /// </summary>
+        Request = 2
+    }
+}