[Snyk] Security upgrade nginx from 1.11 to stable

[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 nginx:stable, as this image has only 78 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	Out-of-Bounds SNYK-DEBIAN8-LIBXML2-429716	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN8-PERL-327620	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN8-PERL-327646	No Known Exploit
	714	Out-of-Bounds SNYK-DEBIAN8-PERL-327734	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN8-PROCPS-309340	No Known Exploit

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