[GEM] Add “heroku”
+ Procfile
Gemfile: move “sqlite3” to the development group
[GEM] Add “foreman”
[GEM] Get rid of "sqlite3", add "pg" instead
Gemfile.lock: update
Gemfile: set the Ruby version
bot: hardcode the channel list to #pry
Procfile: add a newline
database: make failing more informative