1) Add --upgrade flags in install instructions. 2) Fix link to PyPI package page.
1) Add --upgrade flags in install instructions.
2) Fix link to PyPI package page.

ccarse/gtfs-realtime-bindings,ccarse/gtfs-realtime-bindings,ccarse/gtfs-realtime-bindings,ccarse/gtfs-realtime-bindings,ccarse/gtfs-realtime-bindings