[Snyk] Upgrade sanitize-html from 1.4.2 to 1.21.1

[snyk-bot]

Snyk has created this PR to upgrade sanitize-html from 1.4.2 to 1.21.1.

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.

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• The recommended version is 45 versions ahead of your current version.
• The recommended version was released 23 days ago, on 2020-01-17.

The recommended version fixes:

Severity	Issue	Exploit Maturity
	Prototype Pollution SNYK-JS-LODASH-73638	No Known Exploit
	Prototype Pollution SNYK-JS-LODASH-450202	Proof of Concept
	Cross-site Scripting (XSS) npm:sanitize-html:20161026	Mature
	Cross-site Scripting (XSS) npm:sanitize-html:20160801	No Known Exploit
	Cross-site Scripting (XSS) npm:sanitize-html:20141024	No Known Exploit
	Prototype Pollution npm:lodash:20180130	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-73639	No Known Exploit

Release notes

Package name: sanitize-html

• 1.21.1 - 2020-01-17
  

  …drunov.

• 1.21.0 - 2020-01-17
  

  1.21.0: new disallowedTagsMode feature, thanks to Yehonatan Zecharia

• 1.20.1 - 2019-04-25
• 1.20.0 - 2018-12-17
  

  1.20.0: use files key to reduce size of npm package, thanks to Steven

• 1.19.3 - 2018-12-05
  

  …` that might or might not have XSS implications](#269).

• 1.19.2 - 2018-12-03
  
  • Switched out the heavy postcss dependency for the lightweight css-tree module. No API changes. Thanks to Justin Braithwaite.
  • Various doc updates. Thanks to Pulkit Aggarwal and Cody Robertson.
• 1.19.1 - 2018-09-28
  

  …never published)

• 1.19.0 - 2018-09-12
  
  • New allowIframeRelativeUrls option. It defaults to true unless allowedIframeHostnames is present, in which case it defaults to false, for backwards compatibility with existing behavior in both cases; however you can now set the option explicitly to allow both certain hostnames and relative URLs. Thanks to Rick Martin.
• 1.18.5 - 2018-09-05
  

  credit

• 1.18.4 - 2018-08-02
  

  1.18.4: removed incorrect browser key

• 1.18.3 - 2018-08-01
  

  iframe protocol relative

• 1.18.2 - 2018-02-20
• 1.18.1 - 2018-02-20
• 1.18.0 - 2018-02-20
• 1.17.0 - 2018-01-15
• 1.16.3 - 2017-12-12
• 1.16.2 - 2017-12-12
• 1.16.1 - 2017-11-21
• 1.16.0 - 2017-11-21
• 1.15.0 - 2017-10-30
• 1.14.3 - 2017-10-30
• 1.14.2 - 2017-10-30
• 1.14.1 - 2017-01-13
• 1.14.0 - 2017-01-13
• 1.13.0 - 2016-07-19
• 1.12.0 - 2016-06-16
• 1.11.4 - 2016-03-28
• 1.11.3 - 2016-01-13
• 1.11.2 - 2015-12-01
• 1.11.1 - 2015-10-13
• 1.11.0 - 2015-10-08
• 1.10.1 - 2015-09-28
• 1.10.0 - 2015-08-31
• 1.9.0 - 2015-08-18
• 1.8.0 - 2015-08-10
• 1.7.2 - 2015-07-22
• 1.7.1 - 2015-07-21
• 1.7.0 - 2015-06-03
• 1.6.1 - 2015-02-18
• 1.6.0 - 2015-02-13
• 1.5.3 - 2015-02-06
• 1.5.2 - 2015-01-26
• 1.5.1 - 2015-01-11
• 1.5.0 - 2015-01-07
• 1.4.3 - 2014-10-14
• 1.4.2 - 2014-09-26

from sanitize-html GitHub release notes

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DeepCode's analysis on #ff2264 found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 0 minor issues. ✔️ 0 issues were fixed.

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