[Snyk] Security upgrade ubuntu from trusty to trusty-20190515

[adamlaska]

This PR was automatically created by Snyk using the credentials of a real user.

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/Dockerfile

We recommend upgrading to ubuntu:trusty-20190515, as this image has only 292 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
	614	NULL Pointer Dereference SNYK-UBUNTU1404-OPENSSL-1049144	No Known Exploit
	614	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-UBUNTU1404-OPENSSL-3314800	No Known Exploit
	829	Off-by-one Error SNYK-UBUNTU1404-SUDO-1065770	Mature
	686	Improper Privilege Management SNYK-UBUNTU1404-SUDO-3234995	Mature
	686	Improper Handling of Exceptional Conditions SNYK-UBUNTU1404-SUDO-473059	Mature

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Improper Privilege Management
🦉 NULL Pointer Dereference

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