v0.4.0rc1

What's Changed

• A --rules-repo=url option for ad-hoc rule use by @nedbat in #98
• three-part tutorial using existing repos by @nedbat in #99
• Support repo-scoped rules by @thatch in #102
• Recognize go.mod as a Go project marker by @thatch in #106
• Add --json flag to ick list-rules by @leticiastroeh in #104
• Don't ignore rules with manual urgency in list-rules and test-rules by @jag250 in #105
• Don't auto create git repos unless testing. by @thatch in #107

Full Changelog: v0.3.3...v0.4.0rc1