change HUBOT_IRC_USERNAME? to HUBOT_IRC_USERNAME
change HUBOT_IRC_USERNAME? to HUBOT_IRC_USERNAME

miyazakijunichi/hubot-irc,Jaglag/hubot-irc,nandub/hubot-irc,BenoitZugmeyer/hubot-irc,miyazakijunichi/hubot-irc,nandub/hubot-irc,BenoitZugmeyer/hubot-irc,Spice-King/hubot-irc,Spice-King/hubot-irc,Jaglag/hubot-irc