appveyor: Try to fix build with new deploy script

Second attempt with modified script.

Author: angularsen

appveyor.yml

@@ -35,4 +35,7 @@ deploy:
     secure: q710an2WFRwLh6rZQ/I9nKlNt/3d5kYkdUoA5Y1a/hZLr3DGZliSayP+ejF6bj30
   skip_symbols: false
   on:
-    branch: master
+    branch: master
+deploy_script:
+  - appveyor DownloadFile https://dist.nuget.org/win-x86-commandline/latest/nuget.exe  
+  - ps: ($artifacts.values | Where-Object {($_.path -like '*.nupkg') -and  !($_.path -like '*.symbols.nupkg')}) | foreach-object {nuget.exe push $_.path -Source https://www.nuget.org/api/v2/package -ApiKey $env:api_key; if ($lastexitcode -ne 0) {throw}}