[Snyk] Security upgrade mem from 1.1.0 to 4.0.0

[conor-mullen]

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
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	469/1000 Why? Has a fix available, CVSS 5.1	Denial of Service (DoS) npm:mem:20180117	Yes	No Known Exploit

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

Commit messages

Package name: mem

The new version differs by 14 commits.

• 159369f 4.0.0
• da4e439 Automatically release memory when an item expires - fixes Remove unused files and dependencies #14 (Docker Update and Continuous Deployment #19)
• a90ebb8 Performance enhancements (Suggestion: Use .env for development environment variables instead of docker-compose.yml #18)
• 77874ca Require Node.js 6
• 16ff264 3.0.1
• cd6320a Delete cache entries older than max age (Add missing unit tests #16)
• 74439cc 3.0.0
• 2189e3c Cache pending promises (Unversioned urls whitelist to move users to versioned urls #12)
• 009ce6a 2.0.0
• 40ea5ab Meta tweaks
• 6b99040 Don't cache rejected promises - fixes Stale while revalidate #8 (Replace the shrinkwrap URL with a deprecation notice #10)
• 86f6dda Add support for prototype method functions - fixes Stale on error #9 (Redirect the files and modules routes #11)
• d436564 Mention `quick-lru` in the readme
• 01a5137 add Related section

See the full diff

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

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[JakeChampion]

Closing this as it is a duplicate of #487