THRIFT-4990 Upgrade to .NET Core 3.1 (LTS)
Client: netstd
Patch: Jens Geyer

This closes #1961
diff --git a/test/netstd/Client/Client.csproj b/test/netstd/Client/Client.csproj
index c406f17..4ed57cb 100644
--- a/test/netstd/Client/Client.csproj
+++ b/test/netstd/Client/Client.csproj
@@ -19,7 +19,7 @@
   -->
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <AssemblyName>Client</AssemblyName>
     <PackageId>Client</PackageId>
     <OutputType>Exe</OutputType>
@@ -31,9 +31,9 @@
     <GenerateAssemblyCopyrightAttribute>false</GenerateAssemblyCopyrightAttribute>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="4.5.2" />
+    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="4.7.0" />
     <PackageReference Include="System.Runtime.Serialization.Primitives" Version="[4.3,)" />
-    <PackageReference Include="System.ServiceModel.Primitives" Version="4.5.3" />
+    <PackageReference Include="System.ServiceModel.Primitives" Version="4.7.0" />
     <PackageReference Include="System.Threading" Version="[4.3,)" />
   </ItemGroup>
   <ItemGroup>
diff --git a/test/netstd/Client/Program.cs b/test/netstd/Client/Program.cs
index 47dabd3..92000da 100644
--- a/test/netstd/Client/Program.cs
+++ b/test/netstd/Client/Program.cs
@@ -42,6 +42,7 @@
                     Console.WriteLine("The 'client' argument is no longer required.");
                     PrintHelp();
                     return -1;
+                case "--performance":
                 case "--performance-test":
                     return Tests.PerformanceTests.Execute();
                 case "--help":