Update CHANGELOG

Author: fabpot

CHANGELOG.md

@@ -3,6 +3,10 @@
 * Use `ActivationStrategy` instead of `actionLevel` when available 
 * Register resettable processors (`ResettableInterface`) for autoconfiguration (tag: `kernel.reset`)
 * Drop support for Symfony 3.4
+* Drop support for PHP < 7.1
+* Fix call to undefined method pushProcessor on handler that does not implement ProcessableHandlerInterface
+* Use "use_locking" option with rotating file handler
+* Add ability to specify custom Sentry hub service
 
 ## 3.6.0 (2020-10-06)