[Snyk] Fix for 1 vulnerabilities

[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:
  • examples/demand-koa/package.json
  • examples/demand-koa/.snyk

Vulnerabilities that will be fixed

With a Snyk patch:

Severity	Issue	Exploit Maturity
	Prototype Pollution npm:hoek:20180212	No Known Exploit

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

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