Automated accessibility testing ~ via "pa11y-ci"

[nfreear]

... Over and above any expert evaluation that may be done !

• https://github.com/pa11y/ci
• https://github.com/pa11y/pa11y-ci/blob/master/CHANGELOG.md#131-2017-12-06
• https://github.com/pa11y/pa11y-ci/blob/master/MIGRATION.md#migrating-from-10-to-20
• https://github.com/pa11y/pa11y/blob/master/MIGRATION.md#migrating-from-40-to-50
• https://developers.google.com/web/updates/2017/04/headless-chrome
• https://github.com/GoogleChrome/puppeteer

Probably should migrate from pa11y-ci 1.3.1 to 2.1.x ... big changes ;).

N.