Modify README.md

- Add notification for removal of pmlogconf

[GF-6145] Notice for removal of pmlogconf

Open-webOS-DCO-1.0-Signed-off-by: Hongjeon Ha <hj.ha@lge.com>

Change-Id: I19f508be0f5f57082356f74c2ec69039ca088006
Reviewed-on: https://g2g.palm.com/2532
Reviewed-by: Build Verification
Reviewed-by: Hongjeon Ha <hj.ha@lge.com>
Tested-by: Hongjeon Ha <hj.ha@lge.com>
Reviewed-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>