[Snyk] Security upgrade golang from 1.9 to 1

[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

• vendor/golang.org/x/net/http2/h2demo/Dockerfile.0

We recommend upgrading to golang:1, as this image has only 95 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-DEBIAN9-MERCURIAL-311063	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN9-MERCURIAL-311070	No Known Exploit
	714	Incorrect Permission Assignment for Critical Resource SNYK-DEBIAN9-MERCURIAL-311113	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-PYTHON27-341379	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-WGET-342192	No Known Exploit

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