4.6.0

Add unsend event and video play complete event #300

• Unsend event has been added
• Video viewing complete event has been added

Add feature of upload audience by file #301

• The audiences property is now optional instead of required for a certain endpoint
• Create audience for uploading user IDs (by file)
• Add user IDs or Identifiers for Advertisers (IFAs) to an audience for uploading user IDs (by file

Add redelivery object for narrowcast #306 @hinoguma

• Support redelivery object for narrowcast