Renames, orderbook changes

CryptoExchange.Net/Interfaces/ISymbolOrderBookEntry.cs

@@ -14,4 +14,15 @@
         /// </summary>
         decimal Price { get; set; }
     }
+
+    /// <summary>
+    /// Interface for order book entries
+    /// </summary>
+    public interface ISymbolOrderSequencedBookEntry: ISymbolOrderBookEntry
+    {
+        /// <summary>
+        /// Sequence of the update
+        /// </summary>
+        long Sequence { get; set; }
+    }
 }