feat: Added support for Ubuntu 22.04

Force the renewal only if is needed

Compare the certificate domain list with the domain list provided in the
inventory to check if we need to renew the certificate to add the new
domain or to delete some domain.

If you force the certbot_force_update, Ansible skips these tasks.

Update package name for ubuntu 18

New certbot version in Ubuntu Focal

Ubuntu 20.04 support

Allow updating existing certs using --extra-vars "certbot_force_update=true

Certbot removed support for trusty

So do we. Reference: https://github.com/certbot/certbot/issues/7183

Fix #17  (travis execution) and notify Galaxy to import automatically

* Split the line instead the noqa statement.

Update README with the supported platforms.

We add the platforms tested with molecule in the CI.

Fix #18

Update the README with the multiple certificates creation information

* Use the name of role correctly: `certbot_nginx`
* The variable `domain_names` is not used in this role.
* Move the multiple certificates instructions to the multiple certificate section

docs use propper role name

Add variable for certbot version

Currently the role breaks when the hard coded version is missing from
the ppa.
This adds the option to specify the version to be installed via a variable.

* Add CI

* Update .travis.yml

Add molecule test

Upgrade certbot version to 0.31.0