fix: make check_pgsql command work

setup.py

@@ -45,7 +45,7 @@ setuptools.setup(
             "check_webserver_availability="
             "perun.proxy.utils.nagios.webserver_availability:main",
             "check_privacyidea=perun.proxy.utils.nagios.check_privacyidea:main",
-            "check_pgsql=perun.proxy.utils.nagios.check_pgsql:main"
+            "check_pgsql=perun.proxy.utils.nagios.check_pgsql:main",
             "metadata_expiration=perun.proxy.utils.metadata_expiration:main",
             "print_docker_versions=perun.proxy.utils.print_docker_versions:main",
             "run_version_script=perun.proxy.utils.run_version_script:main",