corrected the error message

Author: sharmagot

vertica_python/tests/integration_tests/test_tls.py

@@ -343,7 +343,7 @@ def test_tls13_support_auto_negotiation(self):
             tls_version = self._get_tls_version(conn)
 
             if tls_version is None:
-                self.skipTest("Could not determine negotiated TLS version")
+                self.skipTest("Could not determine negotiated TLS version.")
 
             self.assertIn(
                 tls_version,