irclib: Modes aren't case insenstive
irclib: Modes aren't case insenstive

Signed-off-by: James McCoy <91ae71a1168cea0b65ac9975da69d5a7753116be@users.sourceforge.net>

Ban3/Limnoria,ProgVal/Limnoria-test,frumiousbandersnatch/supybot-code,buildbot/supybot,jeffmahoney/supybot,Ban3/Limnoria,ProgVal/Limnoria-test,haxwithaxe/supybot