Include initial walk in bestRoute

[mcsoini]

First of all, thank you so much for this efficient implementation, which is also a great match for my backend use case.

Not sure if a feature or a bug, but when the first leg of the bestRoute is a walk, it is not included in the route. Example:

minotor> .route from Bern to Bern Marzili at 08:00
Arriving to Bern Marzili at 08:11 with 0 transfers from Bern.
Found route from Bern to Bern Marzili:
Leg 1:
  From: Bern (Marzilibahn)
  To: Bern Marzili
  Route: FUNICULAR 2350, Departure: 08:10, Arrival: 08:11

Would you consider changing while (round > 0) to while (round >= 0) in the Result class? This gives

minotor> .route from Bern to Bern Marzili at 08:00
Arriving to Bern Marzili at 08:11 with 0 transfers from Bern.
Found route from Bern to Bern Marzili:
Leg 1:
  From: Bern
  To: Bern (Marzilibahn)
  Transfer: REQUIRES_MINIMAL_TIME, Minimum Transfer Time: 10:00
Leg 2:
  From: Bern (Marzilibahn)
  To: Bern Marzili
  Route: FUNICULAR 2350, Departure: 08:10, Arrival: 08:11

which is more in line with expectations, imo.