feat(activityTypes): Adds webinar.

Author: ryasmi

src/statementConstants/activityTypes.ts

@@ -215,6 +215,11 @@ export const tutorSession = 'http://id.tincanapi.com/activitytype/tutor-session'
  */
 export const video = 'https://w3id.org/xapi/video/activity-type/video';
 
+/**
+ * A seminar conducted over the Internet which may be live or recorded.
+ */
+export const webinar = 'http://id.tincanapi.com/activitytype/webinar';
+
 /**
  * This represents a sequence of processes.
  */