Errors don't exit, process hangs instead.

[Tim Kinnane]

The logger module, via Winston should be exiting on errors, (unless the error came from middleware). However even when logger.exitOnError is set true, the process does not exit after throwing an error.

Ideally I'd like to handle errors with a graceful shutdown, calling bot.shutdown(1) with the argument as the process.exit code, but allowing adapters to disconnect, leaving clean subscriptions and states with their associated providers.