Merge pull request #4 from 0x6b/update-deps

deps: update dependencies

Merge pull request #3 from 0x6b/refactor

feat: specify derives from a flag

Merge pull request #2 from 0x6b/update-deps

deps: update dependencies

Merge pull request #1 from 0x6b/serde

feat: support serde structs output format

hello world