Sort using.

Author: roosmaa

Proguard.Build.Tasks/Tasks/Proguard.cs

@@ -1,10 +1,10 @@
 using System;
-using System.Linq;
+using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using Microsoft.Build.Framework;
 using Microsoft.Build.Utilities;
 using Mono.Cecil;
-using System.Collections.Generic;
 
 namespace BitterFudge.Proguard.Build.Tasks
 {