[Snyk] Security upgrade node from 10.15.1 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

• Dockerfile

We recommend upgrading to node:10, as this image has only 722 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
	786	OS Command Injection SNYK-DEBIAN9-OPENSSL-2807589	No Known Exploit
	714	CVE-2019-9636 SNYK-DEBIAN9-PYTHON35-340072	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-PYTHON35-453739	No Known Exploit
	714	Credentials Management SNYK-DEBIAN9-PYTHON35-584435	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-WGET-342192	No Known Exploit

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