Update CHANGELOG for new RS-485/RS422 functions.

de-vri-es · Apr 23, 2024 · a04fb9e · a04fb9e
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+# Unreleased
+- [add][minor] Add `SerialPort::set_rs4xx_mode()` and `get_rs4xx_mode()` behind `rs4xx` feature flag.
+
 # Version 0.2.21 - 2024-04-15
 - [change][patch] Improve documentation about timeouts and composed operations like `read_exact()` and `write_all()`.