Use the versions of PHP Parser that understand PHP 7.1.

Author: pfrenssen

composer.json

@@ -14,7 +14,7 @@
         "drush/drush": "~9.4",
         "drupal-composer/drupal-scaffold": "~2.2",
         "instaclick/php-webdriver": "^1.4.5",
-        "nikic/php-parser": "~2.1",
+        "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"