Merge pull request #14 from nickbabcock/dependabot/nuget/Microsoft.NET.Test.Sdk-15.8.0

Bump Microsoft.NET.Test.Sdk from 15.6.0 to 15.8.0

OhmGraphite.Test/OhmGraphite.Test.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.8.0" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.1" />