change frequencies_to_stop_times function to allow proper routing

[AlexandraKapp]

Issue: the function frequencies_to_stop_times does not update the trip_ids in trips.txt and stop_times.txt. Therefore, the routing with gtfs_routedoes not work properly.

Routing result before:

With fix:

[mpadge]

Oh yeah, that's a really good point, and thank you very much for the input. This seems like a perfect solution ... but ... the package does not Import: dplyr, so those steps would just need to be converted to base-R equivalent statements. It's mostly just about the left_join, so should be fairly straightforward. Oh, and it actually doesn't even Import: magrittr, so code must also remain pipe-free. If could update that, I'll be very happy to merge. Thanks!

[AlexandraKapp]

thanks! oh, maybe I should have run the checks ;) I'll go ahead and update that

[AlexandraKapp]

now it should work. I'm not quite sure how to make the appveyor check pass, though.

[mpadge]

Don't worry about appveyor - that all looks great. Shall merge in a moment

[mpadge]

One last request: Could you please add your name as role = "ctb" to the DESCRIPTION file? (You don't have to add an ORCID, but feel free to do so if you like). Thanks!