(GH-34) Cross compile for .NET 5

Author: gep13

Source/Cake.DotNetTool.Module.Tests/Cake.DotNetTool.Module.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.1;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net50;netcoreapp2.1;netcoreapp3.1</TargetFrameworks>
     <DebugType>full</DebugType>
     <IsPackable>false</IsPackable>
   </PropertyGroup>

Source/Cake.DotNetTool.Module/Cake.DotNetTool.Module.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net50;netstandard2.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>        
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>