Merge pull request #259 from ckadluba/refactoring-cleanup-tests

Unit tests for MicrosoftExtensionsConfigurationColumnOptionsProvider

Author: ckadluba

src/Serilog.Sinks.MSSqlServer/Configuration/Implementations/Microsoft.Extensions.Configuration/MicrosoftExtensionsColumnOptionsProvider.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
+using System.Security.Cryptography.X509Certificates;
 using Microsoft.Extensions.Configuration;
 
 namespace Serilog.Sinks.MSSqlServer.Configuration