chore(build): detect latest binaries for Windows build

appveyor.yml

@@ -13,7 +13,6 @@ clone_folder: c:\gopath\src\github.com\pact-foundation\pact-go
 environment:
   GOPATH: c:\gopath
   GOVERSION: 1.10
-  PACT_INTEGRATED_TESTS: 1
   PACT_BROKER_HOST: "https://test.pact.dius.com.au"
   PACT_BROKER_USERNAME: "dXfltyFMgNOFZAxr8io9wJ37iUpY42M"
   PACT_BROKER_PASSWORD: "O5AIZWxelWbLvqMd8PkAVycBJh2Psyg1"

scripts/pact.ps1

@@ -1,10 +1,6 @@
 $pactDir = "$env:APPVEYOR_BUILD_FOLDER\pact"
 $exitCode = 0
 
-if ($env:PACT_INTEGRATED_TESTS) {
-  Remove-Item env:\PACT_INTEGRATED_TESTS
-}
-
 # Set environment
 if (!($env:GOPATH)) {
   $env:GOPATH = "c:\go"
@@ -21,18 +17,22 @@ if (Test-Path "$pactDir") {
 Write-Host "--> Creating ${pactDir}"
 New-Item -Force -ItemType Directory $pactDir
 
-Write-Host "--> Downloading Ruby binaries)"
+Write-Host "--> Downloading Latest Ruby binaries)"
 $downloadDir = $env:TEMP
-$version = Get-Contents "./"
-$url = "https://github.com/pact-foundation/pact-ruby-standalone/releases/download/v1.33.1/pact-1.33.1-win32.zip"
+$latestRelease = Invoke-WebRequest https://github.com/pact-foundation/pact-ruby-standalone/releases/latest -Headers @{"Accept"="application/json"}
+$json = $latestRelease.Content | ConvertFrom-Json
+$latestVersion = $json.tag_name
+$url = "https://github.com/pact-foundation/pact-ruby-standalone/releases/download/v$latestVersion/pact-$latestVersion-win32.zip"
 
 Write-Host "    Downloading $url"
 $zip = "$downloadDir\pact.zip"
-if (!(Test-Path "$zip")) {
-  $downloader = new-object System.Net.WebClient
-  $downloader.DownloadFile($url, $zip)
+if (Test-Path "$zip") {
+  Remove-Item $zip
 }
 
+$downloader = new-object System.Net.WebClient
+$downloader.DownloadFile($url, $zip)
+
 Write-Host "    Extracting $zip"
 Add-Type -AssemblyName System.IO.Compression.FileSystem
 [System.IO.Compression.ZipFile]::ExtractToDirectory("$zip", $pactDir)