v0.3.0

Changelog

• 2724635 Migrate CLI to Cobra verb tree; bump to 0.3.0
• 0427c55 Merge branch 'improve-tool-render-styles'
• b48f147 Document snapshot cask caveat and command-name slash-doubling trap
• e7f9075 Merge pull request #1 from eitanpo/improve-tool-render-styles