Updated path resolution for symlinks
Updated path resolution for symlinks

I wanted to symlink the file in vendor/bin to an other folder and `__DIR__` was resolved to this new folder.

by adding `realpath` it resolves the symlink and works again.
nelson6e65/phpunit,ya7lelkom/phpunit,stof/phpunit,CarsonF/phpunit,FireWalkerX/phpunit,chrisbjr/phpunit,luomor/phpunit,HappyRay/phpunit,ezzatron/phpunit,asgrim/phpunit,m157y/phpunit,apinstein/phpunit,giorgiosironi/phpunit,lcp0578/phpunit,WebSeed/phpunit,nonconforme/phpunit,duncan3dc/phpunit,apinstein/phpunit,simohammedhttp/phpunit,masarakki/phpunit,SunDrop/phpunit,MajorCaiger/phpunit,Shaked/phpunit,bradgrohs/phpunit,Maks3w/phpunit,kyale/phpunit,OndraM/phpunit,9040044/phpunit,beealone/phpunit,didiwuliu/phpunit,abacaphiliac/phpunit,darol100/phpunit,matheusgomes17/phpunit,eelf/phpunit,potherca-contrib/phpunit,zhaoyan158567/phpunit,serbanghita/phpunit,apinstein/phpunit,MartinhoOmura/phpunit,Lance0312/phpunit,imshibaji/phpunit,dshafik/phpunit,sebastianbergmann/phpunit,s001dxp/phpunit,abachi/phpunit,malkusch/phpunit,Firehed/phpunit,tronsha/phpunit,Ma27/phpunit,DonaldKellett/phpunit