[Snyk] Security upgrade express from 4.0.0 to 4.16.0

[snyk-bot]

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

Changes included in this PR

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

  • package.json

• Adding or updating a Snyk policy (.snyk) file; this file is required in order to apply Snyk vulnerability patches. Find out more.

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	529/1000 Why? Has a fix available, CVSS 6.3	Non-Constant Time String Comparison npm:cookie-signature:20160804	No	No Known Exploit
	484/1000 Why? Has a fix available, CVSS 5.4	Cross-site Scripting (XSS) npm:express:20140912	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) npm:fresh:20170908	No	No Known Exploit
	399/1000 Why? Has a fix available, CVSS 3.7	Regular Expression Denial of Service (ReDoS) npm:mime:20170907	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) npm:negotiator:20160616	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Denial of Service (DoS) npm:qs:20140806	No	No Known Exploit
	539/1000 Why? Has a fix available, CVSS 6.5	Denial of Service (DoS) npm:qs:20140806-1	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Prototype Override Protection Bypass npm:qs:20170213	No	No Known Exploit
	429/1000 Why? Has a fix available, CVSS 4.3	Directory Traversal npm:send:20140912	No	No Known Exploit
	479/1000 Why? Has a fix available, CVSS 5.3	Root Path Disclosure npm:send:20151103	No	No Known Exploit

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

With a Snyk patch:

Severity	Priority Score (*)	Issue	Exploit Maturity
	399/1000 Why? Has a fix available, CVSS 3.7	Regular Expression Denial of Service (ReDoS) npm:mime:20170907	No Known Exploit

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

Check the changes in this PR to ensure they won't cause issues with your project.

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