v0.6.0: GTFS-RT Multi-Schedule Support

What's Changed

• mcd backward search, fix waiting at second to last station by @julianharbarth in #96
• fix interchange lowerbounds for oneway footpaths by @julianharbarth in #95
• Platform interchange times by @pablohoch in #99
• gtfs: make parser more robust by not requiring every trip to exist by @felixguendling in #183
• Improve GTFS-RT Support by @felixguendling in #182
• fix for cancelled trips by @felixguendling in #187

Full Changelog: v0.5.2...0.6.0