Added PlatformType and PlatformTypeType (for #4)

src/pyrmv/classes/__init__.py

@@ -3,6 +3,7 @@ from .gis import Gis
 from .journey import Journey
 from .leg import Leg
 from .message import Channel, Message, Url
+from .platform_type import PlatformType
 from .stop import Stop, StopTrip
 from .ticket import Ticket
 from .trip import Trip