CHANGELOG: Update the CHANGELOG file
Cc: Christian Hergert # version check
Cc: Christian Mazakas # FFI support
Link:
+liburing-2.4 release
+
+- Add io_uring_{major,minor,check}_version() functions.
+- Add IO_URING_{MAJOR,MINOR,CHECK}_VERSION() macros.
+- FFI support (for non-C/C++ languages integration).
+
liburing-2.3 release
- Support non-libc build for aarch64.
