Downgrade Twig from 3.0 to 1.0
Downgrade Twig from 3.0 to 1.0

To fix "Class 'Twig_Loader_Array' not found" error, when visiting the '/healthz/ui' URL

Close #18

generationtux/php-healthz,generationtux/php-healthz,generationtux/php-healthz