Small refactor and isort+black formatting

src/pyrmv/enums/aff_journey_mode.py

@@ -1,6 +1,8 @@
 from enum import auto
+
 from .auto_name import AutoName
 
+
 class AffectedJourneyMode(AutoName):
     """Enumeration used to declare types of HIM search modes."""
 
@@ -8,4 +10,4 @@ class AffectedJourneyMode(AutoName):
     "Return affected journeys."
 
     OFF = auto()
-    "Do not return affected journeys."
+    "Do not return affected journeys."