Link checker as a service

[abitrolly]

Find a link checker service and provide GitHub integration by checking only links in new changed lines. Public version maintains DB of all checked links. Paid version excludes this info.

[abitrolly]

https://developer.github.com/v3/checks/

[abitrolly]

• https://developer.github.com/changes/2018-05-07-new-checks-api-public-beta/
• https://developer.github.com/apps/building-github-apps/creating-a-github-app/

• https://developer.github.com/changes/2018-04-06-self-serve-onboarding/

• https://developer.github.com/v3/checks/

[abitrolly]

• https://github.com/kubernetes/community/issues/359

[abitrolly]

• https://github.com/kubernetes/test-infra/issues/23255