revert runtime update

Author: tg123

tests/KubernetesClient.Tests/KubernetesClient.Tests.csproj

@@ -1,13 +1,13 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <IsPackable>false</IsPackable>
     <RootNamespace>k8s.tests</RootNamespace>
-    <TargetFrameworks>netcoreapp2.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
-      <PackageReference Include="Microsoft.AspNetCore.All" Version="2.1.5" />
-      <PackageReference Include="Microsoft.Extensions.Logging" Version="2.1.1" />
+      <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.9" />
+      <PackageReference Include="Microsoft.Extensions.Logging" Version="2.0.2" />
       <PackageReference Include="System.Reactive" Version="3.1.1" />
       <PackageReference Include="Nito.AsyncEx" Version="4.0.1" />
   </ItemGroup>
@@ -20,12 +20,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
-    <PackageReference Include="xunit" Version="2.4.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" NoWarn="NU1701">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
-    </PackageReference>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.7.0" />
+    <PackageReference Include="xunit" Version="2.3.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" NoWarn="NU1701" />
 
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.1" />
   </ItemGroup>