Bump postgresql from 9.4-1206-jdbc42 to 42.2.18 (#122)
Bump postgresql from 9.4-1206-jdbc42 to 42.2.18 (#122)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 9.4-1206-jdbc42 to 42.2.18.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/REL42.2.18/CHANGELOG.md)
- [Commits](https://github.com/pgjdbc/pgjdbc/commits/REL42.2.18)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
TwilioDevEd/airtng-servlets,TwilioDevEd/airtng-servlets