Add repo for robo-drupal

Author: tauno

composer.json

@@ -14,6 +14,10 @@
  "type": "composer",
  "url": "https://packagist.drupal-composer.org"
  },
+ {
+ "type": "git",
+ "url": "https://github.com/thinkshout/robo-drupal.git"
+ },
  {
  "type": "git",
  "url": "https://github.com/thinkshout/DrupalDriver.git"