Add missing CHANGES.md entry

Author: matthiasblaesing

CHANGES.md

@@ -18,6 +18,7 @@ Features
 * [#947](https://github.com/java-native-access/jna/pull/947):  Allow retrieval of `ACEs` from `com.sun.jna.platform.win32.WinNT.ACL` even if the contained `ACE` is not currently supported - [@jrobhoward](https://github.com/jrobhoward).
 * [#954](https://github.com/java-native-access/jna/pull/954): Add `c.s.j.Structure.FieldOrder` annotation to define the field order of a structures without implementing `Structure#getFieldOrder()` - [@idosu](https://github.com/idosu).
 * [#959](https://github.com/java-native-access/jna/pull/959): Added `GetProcessTimes` and `GetProcessIoCounters` to `com.sun.jna.platform.win32.Kernel32` - [@dbwiddis](https://github.com/dbwiddis).
+* [#952](https://github.com/java-native-access/jna/issues/952): Added `CreateMutex`, `OpenMutex` and `ReleaseMutex` to `com.sun.jna.platform.win32.Kernel32` - [@matthiasblaesing](https://github.com/matthiasblaesing).
 
 Bug Fixes
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