Bump to nodejs18

This is the latest LTS version for nodejs. Let's future proof this!

Merge pull request #69 from fterh/bugfix-bad-email

Bugfix bad email

Update dependencies

Merge pull request #53 from fterh/fterh-patch-1

Update README.md

Merge pull request #45 from fterh/improve-sender-representation

Improve how sender's name and email address are represented

Merge pull request #44 from fterh/command-replies

Support replying to commands in threaded conversations

Merge pull request #39 from fterh/no-throw-missing-alias

Don't throw an error when receiving emails on non-existent aliases

Merge pull request #29 from fterh/notify-errors

Notify user of errors

Merge pull request #25 from fterh/info-command

Support alias info command

Fix test case