We have just released Certbot 0.9.1. This version of Certbot simply
fixes a bug that was introduced in version 0.9.0 where the command line
flag -q/--quiet wasn't respected in some cases. If you'd like more
details about what the problem was and how we fixed it, take a look at
our 0.9.1 milestone on GitHub:
https://github.com/certbot/certbot/milestone/25?closed=1