Fix namespace import

ILSpy/CommandLineArguments.cs

@@ -16,14 +16,12 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
+using McMaster.Extensions.CommandLineUtils;
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
 
-using McMaster.Extensions.CommandLineUtils;
-
-using TomsToolbox.Essentials;
-
 namespace ICSharpCode.ILSpy
 {
 	internal enum InstancingMode