add dependency on phpunit/php-file-iterator
add dependency on sebastian/cli-parser
raise dependency on phpunit/php-timer 5
drop depency on sebastian/finder-facade
drop depency on symfony/console
sources from git snapshot
switch to phpunit9
raise depency on phpunit/php-timer 3
raise depency on sebastian/version 3
raise depency on PHP 7.3
raise depency on sebastian/finder-facade 2
raise depency on symfony/console 4
use phpunit8 for test suite
