fix readme

Author: fanny-jiang

README.md

@@ -26,9 +26,7 @@ puppet module install datadog-datadog_agent
 - Configuration options for the following integrations have been updated:
   - ElasticSearch
     - `ssl_verify` accepts only Boolean values
-    - `tls_verify`options have been added
-  - PostgreSQL
-    - `custom_metrics` option has been removed. Use `custom_queries` instead.
+    - `tls_verify` options have been added
   - TCP Check
     -  `skip_event` option has been removed sinced Datadog Agent v6.4+