Update CHANGELOG.md (#1046)

Author: mfn

CHANGELOG.md

@@ -9,6 +9,9 @@ All notable changes to this project will be documented in this file.
 - Fix phpdoc generate for custom cast with parameter [\#986 / artelkr](https://github.com/barryvdh/laravel-ide-helper/pull/986)
 - Created a possibility to add custom relation type [\#987 / efinder2](https://github.com/barryvdh/laravel-ide-helper/pull/987)
 
+### Changed
+- Implement DeferrableProvider [\#914 / kon-shou](https://github.com/barryvdh/laravel-ide-helper/pull/914)
+
 2020-09-07, 2.8.1
 -----------------
 ### Added