* replace previous stack php7 variables * properly set stack php = php7.2 and php73 = php7.3 * rename upstream php72 and php73 to avoid issues when migrating from EEv3 * use unix socket in nginx upstream instead of TCP/IP
* add new travis test * remove temporarily few travis test to speed up the build * --experimental args isn't required anymore
* letsencrypt validation in /var/www/html * new static files rules * robots.txt fallback for WP * harden nginx configurations
