src/telegram: Add missing event 'video_note'

References:

  * API Message type: https://core.telegram.org/bots/api#message
  * API v3 progress tracker: https://github.com/yagop/node-telegram-bot-api/issues/332

doc/usage.md

@@ -18,7 +18,7 @@
      `new_chat_photo`, `delete_chat_photo`, `group_chat_created`,
      `game`, `pinned_message`, `migrate_from_chat_id`, `migrate_to_chat_id`,
      `channel_chat_created`, `supergroup_chat_created`,
-     `successful_payment`, `invoice`
+     `successful_payment`, `invoice`, `video_note`
   1. `new_chat_participant`, `left_chat_participant` are **deprecated**
 1. `callback_query`: Received a new incoming [Callback Query][callback-query]
 1. `inline_query`: Received a new incoming [Inline Query][inline-query]

src/telegram.js

@@ -24,7 +24,7 @@ const _messageTypes = [
   'location', 'new_chat_members', 'left_chat_member', 'new_chat_title',
   'new_chat_photo', 'delete_chat_photo', 'group_chat_created', 'game', 'pinned_message',
   'migrate_from_chat_id', 'migrate_to_chat_id', 'channel_chat_created', 'supergroup_chat_created',
-  'successful_payment', 'invoice'
+  'successful_payment', 'invoice', 'video_note'
 ];
 const _deprecatedMessageTypes = [
   'new_chat_participant', 'left_chat_participant'