Change type to long for CLS Compliance

Signed-off-by: Xen <lordofxen@deskasoft.com>

Author: LordOfXen

HashifyNet/Algorithms/XxHash/XxHashConfig.cs

@@ -49,7 +49,7 @@ public class XxHashConfig
 		/// <value>
 		/// The seed.
 		/// </value>
-		public ulong Seed { get; set; } = 0UL;
+		public long Seed { get; set; } = 0UL;
 
 		/// <summary>
 		/// Makes a deep clone of current instance.
@@ -62,4 +62,5 @@ public IXxHashConfig Clone() =>
 				Seed = Seed
 			};
 	}
-}
+
+}