Upgrade to supported build targets #41
Description
Currently builds without error when the build target is .Net 2.1. This build target is no longer supported by MS
When the build target is .Net 3.0 or newer the following build error occurs
Error CS0433 The type 'PermissionSet' exists in both 'System.Security.Permissions, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' Netjs C:\Users\Neal\source\repos\Netjs\Netjs\Dependencies\NRefactory\ICSharpCode.NRefactory.CSharp\Parser\mcs\assembly.cs