Try to reconnect if irc connection fails.

Currently, it tries a few times, but then gives up.

This will cause it to try a few times, then rest for 60 seconds before
starting again.  It will never stop trying with this code (I think).

Fixes #7.
Merge pull request #10 from fedora-infra/feature/retry-irc-connect

Try to reconnect if irc connection fails.