message: Add an example of how to send a messaging type
diff: @@ -488,6 +488,13 @@ controller.hears(['send tagged message'], 'message_received', function (bot, mes
  bot.reply(message, taggedMessage);
  });
  +controller.hears(['send messaging type'], 'message_received', function (bot, message) {
  + var taggedMessage = {
  + "text": "Hello Botkit !",
  + "messaging_type": "UPDATE"
  + };
  + bot.reply(message, taggedMessage);
  +});
  function formatUptime(uptime) {
  var unit = 'second';
  