Small refactor and isort+black formatting

src/pyrmv/classes/__init__.py

@@ -1,9 +1,9 @@
 from .Board import BoardArrival, BoardDeparture, LineArrival, LineDeparture
+from .Client import Client
 from .Gis import Gis
 from .Journey import Journey
 from .Leg import Leg
-from .Message import Message, Channel, Url
+from .Message import Channel, Message, Url
 from .Stop import Stop, StopTrip
 from .Ticket import Ticket
 from .Trip import Trip
-from .Client import Client