Add brackets for last print statement

[1kastner]

No description provided.

[coveralls]

Coverage remained the same at 85.521% when pulling 43ab238 on 1kastner:patch-1 into b9219a9 on tkrajina:master.

[Zverik]

Note that gpxpy is supposed to work on Python 2.7, for which the brackets are an error.

[1kastner]

Well, on https://github.com/tkrajina/gpxpy it is mixed. I used it in a Python 3 project and it worked like a charm. Furthermore, see pull request #143 .

[Zverik]

Ah, okay, I didn't see brackets were used everywhere already. Good luck then :)