Feature repricing min max (#10)

amazon settlement import/export improvements

src/bnhtrade.Core/Extensions.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace bnhtrade.Core
+{
+    static class Extensions
+    {
+        public static bool In<T>(this T item, params T[] items)
+        {
+            if (items == null)
+                throw new ArgumentNullException("items");
+
+            return items.Equals(item);
+        }
+    }
+}