Update DrupalCore to 8.4 and and drush to 9.0

update-core.yml

# How to use
# drupal update:core:84 --directory=/path/to/site
command:
name: update:core:84
description: 'Update DruapalCore fix drush issues.'
vars:
 drupal: 8.4.0-beta1
 drush: 9.0.0-beta4
commands:
# - command: exec
#   arguments:
#     bin: drupal site:new --repository=drupal-composer/drupal-project:8.x-dev --directory=%{{directory}}
- command: exec
  arguments:
    bin: composer remove drush/drush --working-dir=%{{directory}}
- command: exec
  arguments:
    bin: composer require drush/drush:%{{drush}} --no-update --working-dir=%{{directory}}
# - command: exec
#   arguments:
#     bin: drupal site:install standard --db-user=root --db-pass=root --force --no-interaction --root=%{{directory}}
- command: exec
  arguments:
    bin: composer require drupal/core:%{{drupal}} --no-update --working-dir=%{{directory}}
- command: exec
  arguments:
    bin: composer update --working-dir=%{{directory}}
#- command: exec
#  arguments:
#    bin: drupal upex --root=%{{directory}}