message: Update aliases.json
  Update alias.json with an Alias for Windows Server 2019 Datacenter
diff: },
  "Windows":{
  + "Win2019Datacenter":{
  + "publisher":"MicrosoftWindowsServer",
  + "offer":"WindowsServer",
  + "sku":"2019-Datacenter",
  + "version":"latest"
  + },
  "Win2016Datacenter":{
  "publisher":"MicrosoftWindowsServer",
  "offer":"WindowsServer",
  