Merged pull requests:

• Support for FCMv1 #620 (mirkode), #660 (AnilRh) and #673 (SixiS, Henridv & benlangfeld)
• No longer silence content-available notifications for APNs. Reverts the following change from the v6.0.0 release. See https://github.com/rpush/rpush/issues/647.
  • Fix silent APNS notifications for Apns2 and Apnsp8 #596 (shved270189)

Breaking:

• Dropped support for Ruby 2.4, 2.5, 2.6 and Rails 5.2.

Full Changelog