Update README.md

Author: enocom

README.md

@@ -2,7 +2,7 @@
 
 Cloud SQL for MySQL has support for Group IAM Authentication. We recommend all MySQL customers use this feature instead of the workaround here.
 
-Cloud SQL for Postgres is coming soon.
+Cloud SQL for Postgres will have support for Group IAM Authentication soon.
 
 See the [public docs](https://cloud.google.com/sql/docs/mysql/iam-authentication#iam-group-auth) for more info.