chore(deps): update dependency markdownlint-cli to v0.18.0

[renovate]

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

Compare Source

• Update markdownlint dependency to 0.16.0
  • Improves MD026/MD031/MD033/MD038
• Address all npm audit issues

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[codecov-io]

Codecov Report

Merging #25 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #25   +/-   ##
====================================
  Coverage       0%    0%           
====================================
  Files           1     1           
  Lines          12    12           
====================================
  Misses         12    12

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