Update CHANGES.md

Author: dbwiddis

CHANGES.md

@@ -8,6 +8,7 @@ Next Release (4.2.1)
 Features
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 * [#510](https://github.com/java-native-access/jna/pull/510): Added `GetCommState`, `GetCommTimeouts` `SetCommState` and `SetCommTimeouts` to `com.sun.jna.platform.win32.Kernel32`. Added `DCB` structure to `com.sun.jna.platform.win32.WinBase` - [@MBollig](https://github.com/MBollig)
+* [#514](https://github.com/java-native-access/jna/pull/514): Add `host_processor_info` to `com.sun.jna.platform.mac.SystemB`  - [@dbwiddis](https://github.com/dbwiddis)
 
 Bug Fixes
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