代码清理

DHSoftware/Utils/HashHelper.cs

@@ -1,9 +1,5 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Security.Cryptography;
+using System.Security.Cryptography;
 using System.Text;
-using System.Threading.Tasks;
 
 namespace DHSoftware.Utils
 {
@@ -20,4 +16,4 @@ namespace DHSoftware.Utils
             }
         }
     }
-}
+}