Add DNS, DNSSEC examples

What's Changed

• Add application layer example (DNS) by @devlights in #30
• Bump golang.org/x/net from 0.2.0 to 0.7.0 by @dependabot in #31
• Add application layer example (DNSSEC) by @devlights in #33

New Contributors

• @dependabot made their first contribution in #31

Full Changelog: v0.2.0...v0.3.0