Fixed #33

Author: ENikS

src/Interceptors/InstanceInterceptors/InterfaceInterception/InterfaceInterceptorClassGenerator.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using System.IO;
 using System.Reflection;
 using System.Reflection.Emit;
 using Unity.Interception.Interceptors.TypeInterceptors.VirtualMethodInterception.InterceptingClassGeneration;