Topic: fix default format

The old format also included useless nick. I don't know anyone who has used the default meaning it and it annoys people and it just annoyed me.

> XX:XX:XX  -: blah blah blaa (Mikaela)
src/irclib.py: Delay sending SASL authstring until given green light

That means wait until receiving 'AUTHENTICATE +' from the server, which
means the mechanism is supported and we can proceed to send the
authstring.

It generally works anyway, but it's better to follow the standards, plus
old versions of elemental-ircd may crash if we don't do this.
Merge pull request #669 from nyuszika7h/patch/sasl-wait-auth

src/irclib.py: Delay sending SASL authstring until given green light
Merge pull request #663 from Mkaysi/patch-1

Topic: fix default format
README: Remove unbreakable space. (GH-670)