[Snyk] Security upgrade express from 3.21.0 to 4.15.3

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

✨ Snyk has automatically assigned this pull request, set who gets assigned.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	399/1000 Why? Has a fix available, CVSS 3.7	Regular Expression Denial of Service (ReDoS) npm:ms:20170412	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: express

The new version differs by 250 commits.

• 6da454c 4.15.3
• 5cf473d deps: debug@2.6.7
• 6549469 build: mocha@3.4.1
• bc2986f deps: finalhandler@~1.0.3
• 58cfc99 deps: serve-static@1.12.3
• ad4456c deps: send@0.15.3
• 1ba9a9a deps: update example dependencies
• ae0b630 Fix error when res.set cannot add charset to Content-Type
• 5ea2a8f build: Node.js@7.9
• de41c0b Fix res.cookie jsdoc comment
• a13938e tests: add tests for res.location('back')
• 1b6e700 deps: send@0.15.2
• 2d1dade deps: serve-static@1.12.2
• df4f271 deps: type-is@~1.6.15
• c087a45 Fix typo in variable name setPrototypeOf
• 347d4db deps: proxy-addr@~1.1.4
• aabf780 docs: fix the security issues heading format
• 3763d73 examples: replace jade with hbs in mvc example
• 8acaa9a deps: finalhandler@~1.0.1
• dbf092d deps: vary@~1.1.1
• efd7032 build: Add .editorconfig
• 2189ff1 lint: remove trailing new lines from docs
• 245fa89 examples: replace jade with ejs in route-separation
• 1b6ad08 deps: debug@2.6.3

See the full diff

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