added choco version and update.ps1 on manual packages

.appveyor.yml

@@ -53,6 +53,7 @@ install:
 - ps: 'Get-CimInstance win32_operatingsystem -Property Caption, OSArchitecture, Version | fl Caption, OSArchitecture, Version'
 - ps: $PSVersionTable
 - git --version
+- choco --version
 - ps: |
     git clone -q https://github.com/majkinetor/au.git $Env:TEMP/au
     . "$Env:TEMP/au/scripts/Install-AU.ps1" $Env:au_version
@@ -81,7 +82,10 @@ build_script:
                     Write-Host ("{0}`n{1}`n" -f ('-'*60), "PACKAGE: $package")
                     $package_dir = ls -recurse | ? { $_.Name -eq "$package.nuspec"} | select -First 1 | % Directory
                     if (!$package_dir) { Write-Warning "Can't find package '$package'"; continue }
-                    pushd $package_dir; choco pack; Push-Package; popd
+                    pushd $package_dir
+                      if (Test-Path update.ps1 -ea 0) { ./update.ps1 }
+                      choco pack; Push-Package;
+                    popd
                 }
                 return
             }