#15 Update to Drush 9, add DCB and adjust license and CI workflow

.gitlab-ci.yml

 Deploy:
   script:
     - curl -XPOST -H'content-type:application/json' "https://packagist.org/api/update-package?username=${PACKAGIST_USERNAME}&apiToken=${PACKAGIST_API_TOKEN}" -d'{"repository":{"url":"'${CI_PROJECT_URL}'"}}'
+  only:
+    - tags
+    - triggers
+    - schedules

composer.json

@@ -9,7 +9,7 @@
         "Update"
     ],
     "homepage": "https://gitlab.lakedrops.com/composer/plugin/drupal-8-scaffold",
-    "license": "GPL-2.0+",
+    "license": "GPL-2.0-or-later",
     "authors": [
         {
             "name": "Jürgen Haas",
@@ -54,13 +54,14 @@
         "drupal/navbar_filter": "^1.1",
         "drupal/security_review": "1.x-dev",
         "drupal/stage_file_proxy": "^1.0-alpha3",
-        "drush/drush": "9.0-beta4",
+        "drush/drush": "^9.0",
         "lakedrops/composer-scripts": "^0.1",
         "lakedrops/docker4drupal": "^0.8",
         "lakedrops/dorgflow": "^0.3"
     },
     "require-dev": {
         "composer/composer": "^1.5.0",
+        "drupal-code-builder/drupal-code-builder-drush": "^9.0",
         "phpunit/phpunit": "^4.8.0"
     },
     "minimum-stability": "dev",