Bump openssl from 0.10.16 to 0.10.18
Bump openssl from 0.10.16 to 0.10.18

Bumps [openssl](https://github.com/sfackler/rust-openssl) from 0.10.16 to 0.10.18.
- [Release notes](https://github.com/sfackler/rust-openssl/releases)
- [Changelog](https://github.com/sfackler/rust-openssl/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sfackler/rust-openssl/compare/openssl-v0.10.16...openssl-v0.10.18)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
tempbottle/trust-dns