RestFB Messenger Changelog

Aligned with Messenger Platform 2.2 release
Added required messaging_type property (https://developers.facebook.com/docs/messenger-platform/send-messages#messaging_types) to all send operations
- Note that this is a breaking change impacting all users
Added support for the open graph template
Added support for the media template
Added support for additional webhook callbacks:
- Policy enforcement
- App roles
- Take thread control
- Pass thread control
- Standby
Updated the available message tags (https://developers.facebook.com/docs/messenger-platform/send-messages/message-tags)
Upgraded RestFB dependency to latest 1.48.0
Upgraded Spring Boot Starter to latest Spring Boot 1.5.9
Updated default Facebook API version to 2.11

Added support for Message Tags (https://developers.facebook.com/docs/messenger-platform/send-api-reference/tags)
- Added support for adding a tag to messages (thanks @ryacobi for the pull request)
- Added support for retrieving the supported list of message tags
Upgraded RestFB dependency to latest 1.40.1
Upgraded Spring Boot Starter to latest Spring Boot 1.5.3

Upgraded RestFB dependency to latest 1.36.0
- Fix CallToAction object (restfb/restfb#637)
Upgraded Spring Boot Starter to latest Spring Boot 1.5.1
Updated license header to 2017

Aligned with Messenger Platform 1.3 release
- Added support for the new list template
- Added support for the new referral callback
Added support for changing thread settings
Added support for push notification type
Added Messenger#getUserProfile method with varargs fields argument
Added Objects#requireNonNull check for required arguments
Upgraded RestFB dependency to latest 1.34.0
Updated default Facebook API version to 2.8

Initial release
- RestFB Messenger Core module
- RestFB Messenger Spring Boot Starter module

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