Bump Microsoft.NET.Test.Sdk from 15.0.0 to 16.2.0 in /PreMailer.… (#177)

Bump Microsoft.NET.Test.Sdk from 15.0.0 to 16.2.0 in /PreMailer.Net/PreMailer.Net.Tests

Author: martinnormark

PreMailer.Net/PreMailer.Net.Tests/PreMailer.Net.Tests.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
     <PackageReference Include="Moq" Version="4.7.63" />
     <PackageReference Include="MSTest.TestFramework" Version="1.3.2" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.3.2" />