Preparing for release, 0.3.0.
Preparing for release, 0.3.0.

dblock/slack-ruby-bot,slack-ruby/slack-ruby-bot,cakejelly/slack-ruby-bot,MarkySmarky/slack-ruby-bot,orta/slack-ruby-bot,maclover7/slack-ruby-bot,ZubKonst/slack-ruby-bot