Bump dns-packet from 1.3.1 to 1.3.4 in /docs

Bumps [dns-packet](https://github.com/mafintosh/dns-packet) from 1.3.1 to 1.3.4.
- [Release notes](https://github.com/mafintosh/dns-packet/releases)
- [Changelog](https://github.com/mafintosh/dns-packet/blob/master/CHANGELOG.md)
- [Commits](mafintosh/dns-packet@v1.3.1...v1.3.4)

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