GH-6: Drupal 9 dependencies.

composer.json

@@ -4,21 +4,20 @@
     "type": "library",
     "license": "EUPL-1.2",
     "require": {
-        "php": "~7.1",
-        "drupal/core": "~8.6",
+        "php": "~7.2",
+        "drupal/core": "^8.9 || ^9",
         "drupal/drupal-extension": "~4.0"
     },
     "require-dev": {
         "composer/installers": "~1.2",
-        "consolidation/robo": "~1.3",
-        "drush/drush": "~9.4",
-        "drupal-composer/drupal-scaffold": "~2.2",
+        "drush/drush": "~10.3",
+        "drupal/core-composer-scaffold": "^8.9 || ^9",
         "guzzlehttp/guzzle": "~6.3",
         "instaclick/php-webdriver": "^1.4.5",
         "nikic/php-parser": "~3.0|~4.0",
-        "openeuropa/code-review": "^1.0.0-alpha4",
-        "openeuropa/task-runner": "^1.0.0-beta3",
-        "webflo/drupal-core-require-dev": "~8.6"
+        "openeuropa/code-review": "~1.6",
+        "openeuropa/task-runner": "^1.0.0-beta6",
+        "drupal/core-dev": "^8.9 || ^9"
     },
     "scripts": {
         "post-install-cmd": "./vendor/bin/run drupal:site-setup",

docker-compose.yml

@@ -1,7 +1,7 @@
 version: '2'
 services:
   web:
-    image: fpfis/httpd-php-dev:7.2
+    image: fpfis/httpd-php-dev:7.3
     working_dir: /var/www/html
     ports:
       - 8080:8080