Travel::Status::DE::DeutscheBahn v5.02

Fix calls to $journey->route crashing in handle_day_change or add_message in some circumstances if the $hafas object that created $journey has gone out of scope (and become eligible for garbage collection) in the meantime. The culprit was a mis-application of weaken() introduced in v5.01.
hafas-m: Add -v/--via option