[Snyk] Security upgrade node from 10.4.0 to 10

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• app.Dockerfile

We recommend upgrading to node:10, as this image has only 671 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	714	Integer Overflow or Wraparound SNYK-DEBIAN8-PYTHON27-306460	No Known Exploit
	714	Arbitrary Command Injection SNYK-DEBIAN8-PYTHON27-306502	No Known Exploit
	714	CVE-2019-9636 SNYK-DEBIAN8-PYTHON27-340042	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN8-PYTHON27-341356	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN8-WGET-342200	No Known Exploit

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