MaxListenersExceededWarning: Possible EventEmitter memory leak detected

[FloRinke]

After running for an hour (with the issue described in #10) , 116117bot prints this warning:

(node:21) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 exit listeners added to [process]. Use emitter.setMaxListeners() to increase limit
(Use `node --trace-warnings ...` to show where the warning was created)
(node:21) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGINT listeners added to [process]. Use emitter.setMaxListeners() to increase limit
(node:21) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGTERM listeners added to [process]. Use emitter.setMaxListeners() to increase limit
(node:21) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGHUP listeners added to [process]. Use emitter.setMaxListeners() to increase limit

Code is current master with this call (redacted for privacy reasons, reduced timeout for testing purposes):

sudo docker run -it --name 116117bot -e URLS="https://123-iz.impfterminservice.de/impftermine/service?plz=12345,https://678-iz.impfterminservice.de/impftermine/suche/XXXX-XXXX-XXXX/67890" -e PUSHOVER_TOKEN="redacted" -e PUSHOVER_USER="redacted" -e TIMEOUT_REGULAR=60 -e TIMEOUT_ERROR=60 116117bot