Merge pull request #781 from prometheus-community/superq/readme_versions

Update versions listed in the README

Author: sysadmind

README.md

@@ -7,7 +7,7 @@
 
 Prometheus exporter for PostgreSQL server metrics.
 
-CI Tested PostgreSQL versions: `9.4`, `9.5`, `9.6`, `10`, `11`, `12`, `13`, `14`, `15`
+CI Tested PostgreSQL versions: `10`, `11`, `12`, `13`, `14`, `15`
 
 ## Quick Start
 This package is available for Docker: