v0.3-3

Major changes

• New vignette to calculate and visualize isochrones.
• New vignette to calculate and visualize accessibility.
• Significant performance increase in detailed_itineraries() when
  shortest_path = TRUE. Closes #153.
• Paper on the r5r package published on Findings. Closes #108.

Minor changes

• travel_time_matrix() and detailed_itineraries() now output more detailed
  messages in the console, when verbose = TRUE. This shall make debugging the
  package much easier.
• Improved documentation of travel_time_matrix(). Closes #149.
• Checks origins/destinations inputs to make sure they have and id column. Closes #154.

Bug fixes

• Fixed introductory vignette to list only files that are included in the package installation. Closes #111.
• Fixed conflict with {geobr} package when downloading metadata. Closed #137.
• Fixed a bug when when parsing date and time from departure_datetime in detailed_itineraries() and travel_time_matrix(). Closes #147.
  Bug fixes
• Fixed a bug in detailed_itineraries() that caused a crash when the shape of a route in the input GTFS is broken. Closes #145