Gemfile in slack-ruby-bot-server-0.8.1 vs Gemfile in slack-ruby-bot-server-0.8.2

@@ -23,10 +23,9 @@
   gem 'byebug'
   gem 'capybara', '~> 2.15.1'
   gem 'database_cleaner'
   gem 'fabrication'
   gem 'faker'
-  gem 'heroku'
   gem 'hyperclient'
   gem 'mongoid-shell'
   gem 'rack-server-pages'
   gem 'rack-test'
   gem 'rake'