Add Log4j advisory in the README (#577)
Add Log4j advisory in the README (#577)

* Add Log4j advisory on README

* Tweak advisory

* Fix typo
GoogleCloudPlatform/bank-of-anthos,GoogleCloudPlatform/bank-of-anthos,GoogleCloudPlatform/bank-of-anthos,GoogleCloudPlatform/bank-of-anthos