Small refactor and isort+black formatting

src/pyrmv/enums/rt_mode.py

@@ -1,6 +1,8 @@
 from enum import auto
+
 from .auto_name import AutoName
 
+
 class RealTimeMode(AutoName):
     """Enumeration used to declare types of real-time traffic."""
 
@@ -17,4 +19,4 @@ class RealTimeMode(AutoName):
     "Search on real-time data: Connections are computed on the basis of real-time data, using planned schedule only whenever no real-time data is available. All connections computed are feasible with respect to the currently known real-time situation. Additional trains (supplied via real-time feed) will be found if these are part of a fast, comfortable, or direct connection (or economic connection, if economic search is activated)."
 
     SERVER_DEFAULT = auto()
-    "One of the other real-times modes used by default for RMV."
+    "One of the other real-times modes used by default for RMV."