Lower log level when enabling Continuum versioning

i guess we really should not see that normally..

rattail/db/config.py

@@ -176,7 +176,7 @@ def configure_versioning(config, force=False, manager=None, plugins=None, **kwar
             kwargs['plugins'] = plugins
         else:
             kwargs['plugins'] = [TransactionMetaPlugin(), RattailPlugin()]
-        log.info("enabling Continuum versioning")
+        log.debug("enabling Continuum versioning")
         continuum.make_versioned(**kwargs)
 
         # TODO: is this the best way/place to confirm versioning?