Use .Net Core 2.1 preview 2 on AppVeyor

seesharper · seesharper · commit ddc30bc51acb · 2018-04-17T13:21:54.000+02:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -2,6 +2,8 @@ version: 1.0.{build}
 image: Visual Studio 2017
 
 install:
+- ps: iwr https://raw.githubusercontent.com/dotnet/cli/release/2.1.3xx/scripts/obtain/dotnet-install.ps1 -outfile dotnet-install.ps1
+- ps: .\dotnet-install.ps1 -Version 2.1.300-preview2-008530 -InstallDir $env:ProgramFiles/dotnet
 - cmd: choco install dotnet.script
 
 build_script:
