remove errant analysis suppression

Author: jpdillingham

tests/Utility.CommandLine.Arguments.Tests/ArgumentsTests.cs

@@ -30,12 +30,9 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using Xunit;
 
-[assembly: SuppressMessage("StyleCop.CSharp.MaintainabilityRules", "SA1402:FileMayOnlyContainASingleClass", Justification = "Reviewed.")]
-
 namespace Utility.CommandLine.Tests
 {
     [Collection("ArgumentAttribute")]