Fixed typo in setup.py.
Fixed typo in setup.py.

kave/zenhub-slackbot,TimZehta/slackbot,pengzhangdev/slackbot,pengzhangdev/slackbot,lins05/slackbot,lins05/slackbot,grantvix/images,TimZehta/slackbot,merqurio/slackbot,merqurio/slackbot,kave/zenhub-slackbot