Add a dependency on PHPParser. We use it to check if the strict_types declaration is present.

Author: pfrenssen

composer.json

@@ -12,6 +12,7 @@
         "composer/installers": "~1.2",
         "drush/drush": "~9.4",
         "drupal-composer/drupal-scaffold": "~2.2",
+        "nikic/php-parser": "~2.1",
         "openeuropa/code-review": "^1.0.0-alpha4",
         "openeuropa/task-runner": "^1.0.0-beta3",
         "webflo/drupal-core-require-dev": "~8.6"