you should be unbanned. I asked in #freenode and they removed it.
<@Unit193> mutante: I've removed it at this point.
Daniel Zahn <dzahn(a)wikimedia.org>
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Also these can help preventing it from happening again even if you mention
a lot of nicks:
< legoktm> he should also auth with freenode
< paladox> if he gets a wikimedia cloak or a wikipedia cloak the bot will
not kick him.