Update dependency markdownlint-cli to v0.18.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
markdownlint-cli	devDependencies	minor	0.17.0 -> 0.18.0

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Release Notes

igorshubovych/markdownlint-cli

### [`v0.18.0`](https://togithub.com/igorshubovych/markdownlint-cli/releases/v0.18.0) [Compare Source](https://togithub.com/igorshubovych/markdownlint-cli/compare/v0.17.0...v0.18.0) - Update `markdownlint` dependency to 0.16.0 - Improves `MD026`/`MD031`/`MD033`/`MD038` - Address all `npm audit` issues

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