Add revoek reason as option with -R

[webservicebe]

When revoking a certificate it always sends 0 (No reason provided or unspecified) as Reason,
however in many cases the reason for us is 5 (cessationOfOperation).

It would be nice if we had an option for this also (maybe an extra switch like -R --revoke-reson)
The other options 1 (keyCompromise) and 4 (superseded) could also be included

[githubRover]

There were recent changes to revocation reasons in Let's Encrypt. This topic in their community is helpful to guide any changes to getssl

https://community.letsencrypt.org/t/questions-re-upcoming-changes-to-revocation-reasons/182954