check if the station is offline

[vitormil]

The station could be offline and would be nice if you show it somehow in your output.

Take a look at my solution:

• Code: vitormil/bikevitoria-cli@22bcc20
• Screenshot: https://www.dropbox.com/s/hfd8hqeh4khbb60/Screenshot%202016-07-04%2003.02.42.png?dl=0