message: fix missing require in typing example
diff: * This module demonstrates the use of the typing indicator in a conversation, and when using bot.reply
  * Tell your bot "typing dialog" or "typing reply" to see this in action.
  */
  +const { BotkitConversation } = require("botkit");
  +
  module.exports = function(controller) {
  let typing = new BotkitConversation('typing', controller);
  @@ -18,7 +20,7 @@ module.exports = function(controller) {
  // use the before handler to delay the next message
  typing.before('next_thread', async () => {
  - return new Promise((resolve, reject) => {
  + return new Promise((resolve) => {
  // simulate some long running process
  setTimeout(resolve, 3000);
  });
  @@ -33,12 +35,10 @@ module.exports = function(controller) {
  controller.hears('typing reply', 'message', async (bot, message) => {
  await bot.reply(message, {type: 'typing'});
  -
  setTimeout(async () => {
  // will have to reset context because turn has now ended.
  await bot.changeContext(message.reference);
  await bot.reply(message, 'Typed!');
  }, 1000);
  -
  });
  };
  \ No newline at end of file
  