Remove unused usings from invokeformattercommand.cs

Author: Kapil Borle

Engine/Commands/InvokeFormatterCommand.cs

@@ -11,12 +11,8 @@
 //
 
 using System;
-using System.Collections;
-using System.Collections.Generic;
 using System.Globalization;
-using System.Linq;
 using System.Management.Automation;
-using Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic;
 
 namespace Microsoft.Windows.PowerShell.ScriptAnalyzer.Commands
 {