Updated xUnit package references to 2.4.1 (#17)

* Updated xUnit reference to 2.4.1

* Updated test project to .NET Core 3.1 and updated references for running xUnit tests

Xunit.Categories.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27130.2010
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30320.27
 MinimumVisualStudioVersion = 15.0.26124.0
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{AE469D2E-EF21-4F07-B5B4-46BBC4061D10}"
 EndProject

src/Xunit.Categories/Xunit.Categories.csproj

@@ -24,7 +24,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="xunit" Version="2.3.1" />
+    <PackageReference Include="xunit" Version="2.4.1" />
   </ItemGroup>
 
 </Project>

test/Xunit.Categories.Test/Xunit.Categories.Test.csproj

@@ -1,14 +1,22 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
-    <RunTimeFrameworkVersion>2.0.4</RunTimeFrameworkVersion>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
-  <PackageReference Include="xunit" Version="2.3.1" />
-  <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="1.3.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
 
   <ItemGroup>