[Snyk] Upgrade showdown from 1.5.1 to 1.9.1

[KrisPeachyKen]

Snyk has created this PR to upgrade showdown from 1.5.1 to 1.9.1.

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.

---

• The recommended version is 26 versions ahead of your current version.

• The recommended version was released on 5 years ago.

Issues fixed by the recommended upgrade:

	Issue	Score	Exploit Maturity
	Reverse Tabnabbing SNYK-JS-SHOWDOWN-469487	380	No Known Exploit

Release notes

Package name: showdown

• 1.9.1 - 2019-11-02
  

  Bug Fixes

  • openLinksInNewWindow: add rel="noopener noreferrer" to links (1cd281f), closes #670

  Dependecy update

  • yargs: update yargs to latest version ^14.2 (dae65c6)
• 1.9.0 - 2018-11-10
  

  Version 1.9.0 introduces a new feature, the HTML to Markdown converter. This feature is still experimental and is a partial backport of the new Reverse Converter planned for version 2.0.

  Bug Fixes

  • italicsAndBold: fix issue with consecutive spans (#608) (5c0d67e), closes #544
  • underline: fix issue with consecutive spans (81edc70)

  Features

  • converter.makeMarkdown: [EXPERIMENTAL] add an HTML to MD converter (e4b0e69), closes #388 #233
• 1.8.7 - 2018-10-16
  

  Bug Fixes

  • emojis: fix emoji excessive size (4aca41c)
  • gfm-codeblocks:
    • add support for spaces before language declaration (24bf7b1), closes #569
    • leading space no longer breaks gfm codeblocks (828c32f), closes #523
  • images: fix js error when using image references (980e702), closes #585
  • literalMidWordAsterisks: now parses single characters enclosed by * correctly (fe70e45), closes #478
  • mentions: allow for usernames with dot, underscore and dash (dfeb1e2), closes #574
  • nbsp: fix replacing of nbsp with regular spaces (8bc1f42)
• 1.8.6 - 2017-12-22
• 1.8.5 - 2017-12-10
• 1.8.4 - 2017-12-05
• 1.8.3 - 2017-11-28
• 1.8.2 - 2017-11-11
• 1.8.1 - 2017-11-01
• 1.8.0 - 2017-10-24
• 1.7.6 - 2017-10-06
• 1.7.5 - 2017-10-02
• 1.7.4 - 2017-09-08
• 1.7.3 - 2017-08-23
• 1.7.2 - 2017-08-05
• 1.7.1 - 2017-06-02
• 1.7.0 - 2017-06-01
• 1.6.4 - 2017-02-06
• 1.6.3 - 2017-01-30
• 1.6.2 - 2017-01-29
• 1.6.1 - 2017-01-28
• 1.6.0 - 2017-01-09
• 1.5.5 - 2016-12-30
• 1.5.4 - 2016-12-23
• 1.5.3 - 2016-12-19
• 1.5.2 - 2016-12-17
• 1.5.1 - 2016-12-01

from showdown GitHub release notes

---

Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• This PR was automatically created by Snyk using the credentials of a real user.
• Max score is 1000. Note that the real score may have changed since the PR was raised.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open upgrade PRs.

For more information:

• 🧐 View latest project report
• 📜 Customise PR templates
• 🛠 Adjust upgrade PR settings
• 🔕 Ignore this dependency or unsubscribe from future upgrade PRs