fix: update prek rev in README.md during mirror

[Anselmoo]

Closes #171

Problem

mirror.py updates all pre-commit YAML-style rev: entries in README.md but silently skips the prek TOML-style rev = entry. After many mirror runs the prek block drifted 18 releases behind:

rev = "v0.15.0"  # ← never updated

while all pre-commit blocks showed the current version:

rev: v0.15.18  # ← correctly updated

Root cause

replace_readme_md matched rev: v\d+… (colon, no quotes) but not rev = "v\d+…" (equals + quotes).

Fix

One additional re.sub call in replace_readme_md:

content = re.sub(r'rev = "v\d+\.\d+\.\d+"', f'rev = "v{version}"', content)

The second commit also corrects the currently stale rev = "v0.15.0" in README.md to v0.15.18.

---

Note: Tools like repo-release-tools can help prevent this class of bug by declaring all version string locations as pin_targets in pyproject.toml — if a location is missing from the config, rrt release check flags it before it can drift.

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[MichaReiser]

Thank you