v0.4

What's Changed

• refactor: move gen command to more efficient management with interface by @alegrey91 in #13
• chore: replaced getRuleById with go-iptables ListById function by @alegrey91 in #14
• refactor: move generation subcommands to more efficient use of interfaces by @alegrey91 in #15
• feat: add rule validation by @alegrey91 in #17
• feat: add json printer by @alegrey91 in #18
• feat: add yaml printer by @alegrey91 in #19

Full Changelog: v0.3...v0.4