[Snyk] Upgrade highlight.js from 9.15.10 to 9.18.1

[a-martynovich]

Snyk has created this PR to upgrade highlight.js from 9.15.10 to 9.18.1.

As this is a private repository, Snyk-bot does not have access. Therefore, this PR has been created automatically, but appears to have been created by a real user.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 6 versions ahead of your current version.
• The recommended version was released a month ago, on 2020-02-01.

Release notes

Package name: highlight.js

• 9.18.1 - 2020-02-01
  

  Quick release to resolve #2375

• 9.18.0 - 2020-01-20
  

  release 9.18.0

• 9.17.1 - 2019-12-12
  

  bump 9.17.1

• 9.17.0 - 2019-12-11
  

  chore: split changelog into core and language improvements

• 9.16.2 - 2019-11-01
  

  9.16.2

• 9.16.1 - 2019-10-31
  

  9.16.1

• 9.15.10 - 2019-08-20
  

  9.15.10

from highlight.js GitHub release notes

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