Add .NET Standard 2.1 target (#51)

* Add .NET Standard 2.1 target

* Update AppVeyor image

* Update Cake

* Remove out-of-date comment

Author: arnaudmaichac

appveyor.yml

@@ -1,4 +1,4 @@
-os: Visual Studio 2017
+os: Visual Studio 2019
 
 # Build script
 build_script:

build.cake

@@ -9,15 +9,15 @@ var configuration = Argument<string>("configuration", "Release");
 // EXTERNAL NUGET TOOLS
 //////////////////////////////////////////////////////////////////////
 
-#Tool "xunit.runner.console"
-#Tool "GitVersion.CommandLine"
-#Tool "Brutal.Dev.StrongNameSigner"
+#tool nuget:?package=xunit.runner.console&version=2.4.1
+#tool nuget:?package=GitVersion.CommandLine&version=5.0.1
+#tool nuget:?package=Brutal.Dev.StrongNameSigner&version=2.4.0
 
 //////////////////////////////////////////////////////////////////////
 // EXTERNAL NUGET LIBRARIES
 //////////////////////////////////////////////////////////////////////
 
-#addin "Cake.FileHelpers"
+#addin nuget:?package=Cake.FileHelpers&version=3.2.1
 
 ///////////////////////////////////////////////////////////////////////////////
 // GLOBAL VARIABLES
@@ -192,7 +192,7 @@ Task("__BuildSolutions")
             settings
                 .SetConfiguration(configuration)
                 .WithProperty("TreatWarningsAsErrors", "true")
-                .UseToolVersion(MSBuildToolVersion.VS2017)
+                .UseToolVersion(MSBuildToolVersion.VS2019)
                 .SetVerbosity(Verbosity.Minimal)
                 .SetNodeReuse(false));
     }

build.ps1

@@ -111,7 +111,7 @@ if(-Not $SkipToolPackageRestore.IsPresent)
     # Install just Cake if missing config
     else
     {
-        $NuGetOutput = Invoke-Expression "&`"$NUGET_EXE`" install Cake -Version 0.25.0 -ExcludeVersion" # Pin Cake version to 0.25.0; see https://github.com/App-vNext/Polly/issues/416 
+        $NuGetOutput = Invoke-Expression "&`"$NUGET_EXE`" install Cake -Version 0.35.0 -ExcludeVersion"
         Write-Verbose ($NuGetOutput | Out-String)
     }
     Pop-Location

src/Polly.Contrib.Simmy.Specs/Polly.Contrib.Simmy.Specs.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp1.1;netcoreapp2.0;net462;net472</TargetFrameworks>
+    <TargetFrameworks>netcoreapp1.1;netcoreapp2.1;netcoreapp3.0;net462;net472</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

src/Polly.Contrib.Simmy.nuspec

@@ -29,6 +29,9 @@
       <group targetFramework="netstandard2.0">
         <dependency id="Polly" version="7.1.0" />
       </group>
+      <group targetFramework="netstandard2.1">
+        <dependency id="Polly" version="7.1.0" />
+      </group>
     </dependencies>
   </metadata>
   <files>

src/Polly.Contrib.Simmy/Polly.Contrib.Simmy.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard1.1;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>netstandard1.1;netstandard2.0;netstandard2.1</TargetFrameworks>
     <AssemblyName>Polly.Contrib.Simmy</AssemblyName>
     <RootNamespace>Polly.Contrib.Simmy</RootNamespace>
     <Version>0.1.0</Version>