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default v2.4
links edge is no longer available. use feed
https://developers.facebook.com/docs/apps/changelog#v2_4_changes
https://developers.facebook.com/docs/apps/changelog#v2_4_changes
https://developers.facebook.com/docs/apps/changelog#v2_4_changes
https://developers.facebook.com/docs/apps/changelog#v2_4_changes
https://developers.facebook.com/docs/apps/changelog#v2_4_changes
https://developers.facebook.com/docs/apps/changelog#v2_4_changes
ps.
outbox isn't mentioned in the doc, but read_mailbox deprecation causes outbox deprecation too.
update graph api version to 2.8
update gem version
remove applications edge
update message_tags json data format
align with features in v2.8
align with features in v2.7
align with features in v2.6
align with features in v2.5
align with features in v2.4