message: Use latest instead of ~2 for function app version
  Rather than hard-code a version, just use latest
diff: @@ -142,7 +142,7 @@ export class SiteStep extends WizardStep {
  },
  {
  name: 'FUNCTIONS_EXTENSION_VERSION',
  - value: '~2' // This means use latest version with major version "2"
  + value: 'latest'
  },
  {
  name: 'WEBSITE_CONTENTAZUREFILECONNECTIONSTRING',
  