remove unused imports

Author: drewcassidy

include/Log.cs

@@ -1,10 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Reflection;
 using System.Runtime.CompilerServices;
-using System.Text;
-using System.Threading.Tasks;
 using UnityEngine;
 
 namespace KSPBuildTools