Critical Fix 🚨

This is a patch release fixing a critical bug introduced in v0.3.19 that prevented PR comments from displaying violation details.

What Was Broken

• Parser couldn't extract Current text and Suggested fix from LLM responses
• PR comments showed violations without the actual problematic text or fixes
• Caused by mismatch: prompts instructed LLM to use ~~~markdown fences, but parser only looked for \``markdown`

What's Fixed

• ✅ Parser now accepts both backtick (```) and tilde (~~~) code fences
• ✅ Regex patterns updated: (?:\``|~~~)` matches either fence type
• ✅ PR comments now correctly display Current text and Suggested fix sections

Impact

• Severity: Critical - affected all PR comment generation
• Introduced: v0.3.19 (when we switched to tilde fences)
• Fixed: v0.3.21

Recommendation: Update immediately if using v0.3.19 or v0.3.20

Full Changelog: https://github.com/QuantEcon/action-style-guide/blob/main/CHANGELOG.md