add puppet to wechaty event names

src/events/wechaty-events.ts

@@ -22,6 +22,7 @@ const WECHATY_EVENT_DICT = {
   dong      : 'Should be emitted after we call `Wechaty.ding()`',
   error     : "Will be emitted when there's an Error occurred.",
   heartbeat : 'Will be emitted periodically after the Wechaty started. If not, means that the Wechaty had died.',
+  puppet    : 'Will be emitted when the puppet has been set.',
   ready     : 'All underlined data source are ready for use.',
   start     : 'Will be emitted after the Wechaty had been started.',
   stop      : 'Will be emitted after the Wechaty had been stopped.',