Bump maxminddb from 0.1.12 to 0.1.19 (#52)
Bump maxminddb from 0.1.12 to 0.1.19 (#52)

Bumps [maxminddb](https://github.com/yhirose/maxminddb) from 0.1.12 to 0.1.19.
- [Release notes](https://github.com/yhirose/maxminddb/releases)
- [Changelog](https://github.com/yhirose/maxminddb/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yhirose/maxminddb/compare/v0.1.12...v0.1.19)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
zooniverse/zoo-event-stats,zooniverse/zoo-event-stats