Add missing SkippableFact dependency

Author: fredrikhr

test/THNETII.Octokit.Test/THNETII.Octokit.Test.csproj

@@ -7,11 +7,12 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="1.3.0" />
     <PackageReference Include="MartinCostello.Logging.XUnit" Version="0.1.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.2" />
-    <PackageReference Include="coverlet.collector" Version="1.3.0" />
+    <PackageReference Include="Xunit.SkippableFact" Version="1.4.8" />
   </ItemGroup>
 
   <ItemGroup>