docs(readme): fix broken link to WAI-ARIA spec

GoogleChrome / accessibility-developer-tools

This is a library of accessibility-related testing and utility code.

Apache License 2.0

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Open Splaktar opened 5 years ago

Splaktar commented 5 years ago

Fixes #369

Splaktar commented 5 years ago

The Travis failure appears to be a flake since this PR only changes the README.md file.