lib/chatterbot/dsl.rb
def consumer_key(k)
      bot.deprecated "Setting consumer_key outside of your config file is deprecated!",  Kernel.caller.first
      bot.config[:consumer_key] = k
    end
def consumer_key(k)
      bot.deprecated "Setting consumer_key outside of your config file is deprecated!",  Kernel.caller.first
      bot.config[:consumer_key] = k
    end
set the consumer key
 @param k [String] the consumer key