1.9.0

• Update .gitignore to include router file for PHP's built-in webserver, which was added in Drupal 8.5 (./docroot/.ht.router.php)
• Optimize composer install command on Shippable CI
• Update default Platform.sh settings to catch up with changes on the platform:
  • Make sure project utilizes all 5Gb of space available
  • Improve .environment and settings.platformsh.php files
  • New default file mounts: '/.drush': 'shared:files/.drush' and '/drush-backups': 'shared:files/drush-backups'
  • Deny direct access to configuration files
  • Improve handling of nested environment variables
  • Update default PHP version to 7.2
  • Add automatic snapshot creation and certificate renewal cron jobs
• Updated vendor libraries:
  • Drupal Scaffold (drupal-composer/drupal-scaffold: ^2.5)
  • Drupal Core (drupal/core: ^8.6.0)
• Test this project against PHP 7.1 and 7.2 on Travis CI, drop support of PHP 5.6 and 7.0