[Snyk] Upgrade helmet from 3.21.0 to 3.21.3

[snyk-bot]

Snyk has created this PR to upgrade helmet from 3.21.0 to 3.21.3.

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 3 versions ahead of your current version.
• The recommended version was released a month ago, on 2020-02-24.

The recommended version fixes:

Severity	Issue	Exploit Maturity
	Configuration Override SNYK-JS-HELMETCSP-469436	No Known Exploit

Release notes

Package name: helmet

• 3.21.3 - 2020-02-24
  

  3.21.3

• 3.21.2 - 2019-10-21
  

  3.21.2

• 3.21.1 - 2019-09-20
  

  3.21.1

• 3.21.0 - 2019-09-04
  

  3.21.0

from helmet GitHub release notes

Commit messages

Package name: helmet

• 903c88e 3.21.3
• 9c359ba Update changelog for 3.21.3 release
• a857597 Update helmet-csp to v2.9.5
• d911036 Stop testing on Node 6, start testing on Node 12
• a7b5b0e Update Sinon to 9.0.0
• ebf480e Update Mocha to 7.0.1
• 2b37fcf 3.21.2
• a238c49 Update changelog for 3.21.2 release
• 7b87cf1 Update Mocha and Sinon to latest versions
• 675540b Update helmet-csp to v2.9.4
• 5d964d4 3.21.1
• 1e9b8ea Update changelog for 3.21.1 release
• 86f1f59 Update helmet-csp to 2.9.2
• 76ca5bd Update Standard devDependency to latest version

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