Added 3131 netcore

appveyor.yml

@@ -1,5 +1,20 @@
 version: 1.0.0-{branch}-{build}
 
+os: Visual Studio 2015
+
+environment:
+  matrix:
+    - CLI_VERSION: 1.0.0-preview2-003131
+
+install:
+   - ps: $url = "https://dotnetcli.blob.core.windows.net/dotnet/preview/Binaries/$($env:CLI_VERSION)/dotnet-dev-win-x64.$($env:CLI_VERSION.ToLower()).zip"
+   - ps: $env:DOTNET_INSTALL_DIR = "$pwd\.dotnetsdk"
+   - ps: mkdir $env:DOTNET_INSTALL_DIR -Force | Out-Null
+   - ps: $tempFile = [System.IO.Path]::GetTempFileName()
+   - ps: (New-Object System.Net.WebClient).DownloadFile($url, $tempFile)
+   - ps: Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory($tempFile, $env:DOTNET_INSTALL_DIR)
+   - ps: $env:Path = "$env:DOTNET_INSTALL_DIR;$env:Path"
+
 branches:
   only:
     - master
@@ -9,7 +24,8 @@ pull_requests:
   do_not_increment_build_number: true
 
 build_script:
-  - cmd: call cmd /C "call dotnet --info & cd .\build & pack.flurl.cmd & pack.flurl.http.cmd"  
+  - cmd: dotnet --info
+  - cmd: call cmd /C "cd .\build & pack.flurl.cmd & pack.flurl.http.cmd"  
 
 test_script:
   - cmd: call cmd /C "cd .\build & test.cmd"