chore(deps): update dependency mdl to '~>0.18.1'

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mdl (source)	'~>0.17.0' → '~>0.18.1'

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Release Notes

mivok/markdownlint (mdl)

v0.18.1

Compare Source

Fixed

• Fixed crash on startup when using old versions of the uri gem.
  #​606

v0.18.0

Compare Source

Added

• MD034 - Add allow_quoted option.
  #​594
• Add config options for kramdown parser opts: parse_block_html,
  parse_span_html, html_to_native
  #​568
• Support options on codeblock openers
  #​590
• Add front_matter_title parameter for all header-related rules
  #​570

Fixed

• MD024 - Fix crash when allow_different_nesting was set
  #​593
• Handle UTF-8 filenames better with -g
  #​591

Changed

• MD013 - When treat_links_as_single_words is set, also allow
  link references to be on a single line regardless of length
  #​597

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