Tells the user when trains between stations doesn't work.

Better error when RailwayAPI's stupid service decides to stop working for no reason.

With trains between stations

This version adds a minimal implementation of trains between stations, with city names / codes hardcoded into the codebase.

First review deploy

Quick patch for first review.

Changelog

• Conversation no longer ends after a response. User has to explicitly end the conversation.

• If an error occurs, log the stack trace to STDERR and ask the user to try again. (Previously would crash with a stack trace and require a restart.)

First test deploy

First test deploy for project review.

Implemented

• PNR status
• Train route
• Train status