Fix outdated systemd related exception text.

freqtrade/loggers.py

@@ -105,7 +105,7 @@ def setup_logging(config: Config) -> None:
             try:
                 from cysystemd.journal import JournaldLogHandler
             except ImportError:
-                raise OperationalException("You need the systemd python package be installed in "
+                raise OperationalException("You need the cysystemd python package be installed in "
                                            "order to use logging to journald.")
             handler_jd = get_existing_handlers(JournaldLogHandler)
             if handler_jd:

tests/test_configuration.py

@@ -719,7 +719,7 @@ def test_set_loggers_journald_importerror(import_fails):
               'logfile': 'journald',
               }
     with pytest.raises(OperationalException,
-                       match=r'You need the systemd python package.*'):
+                       match=r'You need the cysystemd python package.*'):
         setup_logging(config)
     logger.handlers = orig_handlers