def validate
      check_ruby_verison
      check_default_handlers

      begin
        Bundler.require
      rescue Bundler::GemfileNotFound
        say I18n.t("lita.cli.no_gemfile_warning"), :red
        abort
      end

      Lita.load_config(options[:config])
    end
def validate
      check_ruby_verison
      check_default_handlers

      begin
        Bundler.require
      rescue Bundler::GemfileNotFound
        say I18n.t("lita.cli.no_gemfile_warning"), :red
        abort
      end

      Lita.load_config(options[:config])
    end
Outputs detailed stacktrace when there is a problem or exit 0 when OK.
 You can use this as a pre-check script for any automation
 @return [void]