test: add line to README to verify path filters skip CI

Documentation-only changes should not trigger CI workflows

Signed-off-by: Hanxi Zhang <hanxizh@amazon.com>

Author: hanxizh9910

README.md

@@ -370,3 +370,4 @@ Wilmington, Delaware 19802-4447
 [1]: https://github.com/valkey-io/valkey/blob/unstable/COPYING
 [2]: https://github.com/valkey-io/valkey/blob/unstable/CONTRIBUTING.md
 [3]: https://github.com/valkey-io/valkey/blob/unstable/SECURITY.md
+