organize usings

test/Microsoft.AspNetCore.Cors.Test/CorsServiceTests.cs

@@ -3,8 +3,8 @@
 
 using System;
 using Microsoft.AspNetCore.Http;
-using Xunit;
 using Microsoft.Extensions.Logging.Testing;
+using Xunit;
 
 namespace Microsoft.AspNetCore.Cors.Infrastructure
 {
@@ -1081,4 +1081,4 @@ namespace Microsoft.AspNetCore.Cors.Infrastructure
             public string failureReason { get; set; }
         }
     }
-}
+}