fix require-dev array edge case
fix require-dev array edge case

puteulanus/heroku-buildpack-php,thecsea/heroku-buildpack-php-with-ioncube,dzuelke/heroku-buildpack-php,alzheic/heroku-buildpack-aop,puteulanus/heroku-buildpack-php,thecsea/heroku-buildpack-php-with-ioncube,puteulanus/heroku-buildpack-php,heroku/heroku-buildpack-php,thecsea/heroku-buildpack-php-with-ioncube,alzheic/heroku-buildpack-aop,jayelkaake/heroku-buildpack-magento,emeth-/heroku-buildpack-php,a2service/heroku-buildpack-php,emeth-/heroku-buildpack-php,heroku/heroku-buildpack-php,a2service/heroku-buildpack-php,heroku/heroku-buildpack-php,alzheic/heroku-buildpack-aop,jayelkaake/heroku-buildpack-magento,emeth-/heroku-buildpack-php,dzuelke/heroku-buildpack-php,dzuelke/heroku-buildpack-php,jayelkaake/heroku-buildpack-magento,a2service/heroku-buildpack-php,heroku/heroku-buildpack-php,emeth-/heroku-buildpack-php