Changes

[https://github.com/brunopulis/awesome-a11y Awesome-A11Y ] - pretty comprehensive list of specifications, guides, articles, and talks.

[http://diagramcenter.org/standards-and-practices/accessible-image-sample-book.html The Accessible Image Sample Book by DIAGRAM] - Very instructive guide to make accessible images (charts, maps, diagrams) in an educational contexts. It is also available on [https://github.com/benetech/AccessibleImageSampleBook Github].