0.3.0

What's Changed

• feat: add self-update command by @clawdeeo in #13
• feat: add checksum verification by @clawdeeo in #14
• feat: add parallel install support by @clawdeeo in #15
• docs: update for 0.3.0 release by @clawdeeo in #16

Full Changelog: 0.2.0...0.3.0