Add Video viewing complete event (#241)

* add video viewing complete event

Author: kTomomi

lib/types.ts

@@ -54,6 +54,7 @@ export type WebhookEvent =
   | MemberJoinEvent
   | MemberLeaveEvent
   | PostbackEvent
+  | VideoPlayCompleteEvent
   | BeaconEvent
   | AccountLinkEvent
   | DeviceLinkEvent
@@ -199,6 +200,18 @@ export type PostbackEvent = {
   postback: Postback;
 } & ReplyableEvent;
 
+/**
+ * Event for when a user finishes viewing a video at least once with the specified trackingId sent by the LINE Official Account.
+ */
+export type VideoPlayCompleteEvent = {
+  type: "videoPlayComplete";
+  /**
+   * ID used to identify a video. Returns the same value as the trackingId assigned to the [video message](https://developers.line.biz/en/reference/messaging-api/#video-message).
+   * String
+   */
+  videoPlayComplete: { trackingId: string };
+} & ReplyableEvent;
+
 /**
  * Event object for when a user enters or leaves the range of a
  * [LINE Beacon](https://developers.line.biz/en/docs/messaging-api/using-beacons/).