docs: mention MegaLinter in the CI integration section

[nvuillam]

Hi! I maintain MegaLinter, an open-source linters aggregator for CI, and snakefmt has been part of it for a while (descriptor page: https://megalinter.io/latest/descriptors/snakemake_snakefmt/).

Since the README already points to super-linter for running snakefmt in CI, I figured a short line about MegaLinter could help users who prefer that route. Feel free to tweak the wording or close if you'd rather keep the section minimal!

Summary by CodeRabbit

• Documentation
  • Added MegaLinter as an alternative CI linting option.
  • Documented that it supports snakefmt out of the box.
  • Included a link to the MegaLinter setup guide.

[coderabbitai]

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📝 Walkthrough

Walkthrough

The README now documents MegaLinter as an alternative CI linter aggregator and links to its snakefmt integration setup page.

Changes

MegaLinter documentation

Layer / File(s)	Summary
Add MegaLinter integration documentation README.md	The README describes MegaLinter as an alternative CI linter aggregator and links to its snakefmt integration setup page.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: mbhall88

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✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README update to mention MegaLinter in the CI integration section.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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[coderabbitai]

Actionable comments posted: 1

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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@README.md`:
- Line 642: Update the README sentence beginning “Alternatively, MegaLinter” to
use the singular noun phrase “linter aggregator” instead of “linters
aggregator,” preserving the link and surrounding wording.

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• README.md

[nvuillam]

Thanks a lot 😉