Update changelog

CHANGELOG.md

@@ -1,3 +1,15 @@
+### 2.4.0 (2022-xx-xx)
+
+  * Added `persistent`, `timeout`, `writingTimeout`, `connectionTimeout`, `chunkSize` constructor params to SocketHandler and derivatives (#1600)
+  * Added `AsMonologProcessor` PHP attribute which can help autowiring / autoconfiguration of processors if frameworks / integrations decide to make use of it. This is useless when used purely with Monolog (#1637)
+  * Added support for keeping native BSON types as is in MongoDBFormatter (#1620)
+  * Added support for a `user_agent` key in WebProcessor, disabled by default but you can use it by configuring the $extraFields you want (#1613)
+  * Added support for username/userIcon in SlackWebhookHandler (#1617)
+  * Added extension points to BrowserConsoleHandler (#1593)
+  * Fixed error handler signature to accept a null $context which happens with internal PHP errors (#1614)
+  * Fixed a few setter methods not returning `self` (#1609)
+  * Fixed handling of records going over the max Telegram message length (#1616)
+
 ### 2.3.5 (2021-10-01)
 
   * Fixed regression in StreamHandler since 2.3.3 on systems with the memory_limit set to >=20GB (#1592)