- update from php7.2 to php7.3
- includes fix for #20https://github.com/MISP/misp-docker/issues/20
- rewrites the REQUIREMENTS file to remove explicit versioning as they are for python2 packages, not python3
Modification of the file database.php to be able to give the possibility to a MISP to connect to a database with another user.
Addition to download the GPG key on the MISP homepage.