add UrlDownloaderTest to slow group `phpunit --group slow`
add UrlDownloaderTest to slow group `phpunit --group slow`

hechunwen/phpbrew,davidfuhr/phpbrew,pinkbigmacmedia/phpbrew,wellic/phpbrew,hechunwen/phpbrew,wellic/phpbrew,wellic/phpbrew,phpbrew/phpbrew,pierredup/phpbrew,mengzyou/phpbrew,viniciusferreira/phpbrew,viniciusferreira/phpbrew,viniciusferreira/phpbrew,pierredup/phpbrew,hechunwen/phpbrew,svetlyak40wt/phpbrew,kayyyy/phpbrew,mengzyou/phpbrew,morozov/phpbrew,svetlyak40wt/phpbrew,viniciusferreira/phpbrew,pinkbigmacmedia/phpbrew,dduca-sugarcrm/phpbrew,konomae/phpbrew,svetlyak40wt/phpbrew,dduca-sugarcrm/phpbrew,konomae/phpbrew,pinkbigmacmedia/phpbrew,konomae/phpbrew,konomae/phpbrew,kayyyy/phpbrew,pinkbigmacmedia/phpbrew,davidfuhr/phpbrew,mengzyou/phpbrew,phpbrew/phpbrew,zonuexe/phpbrew,mengzyou/phpbrew,williamn/phpbrew,williamn/phpbrew,davidfuhr/phpbrew,wellic/phpbrew,davidfuhr/phpbrew,morozov/phpbrew,zonuexe/phpbrew,dduca-sugarcrm/phpbrew,phpbrew/phpbrew,dduca-sugarcrm/phpbrew,williamn/phpbrew,davidfuhr/phpbrew,zonuexe/phpbrew,kayyyy/phpbrew,pierredup/phpbrew,williamn/phpbrew,svetlyak40wt/phpbrew,zonuexe/phpbrew,hechunwen/phpbrew,pierredup/phpbrew,kayyyy/phpbrew