Support for Font Awesome <span> technique

[HarryAdney]

The extension currently highlights a Font Awesome spans and tags, expecting a role to be added, e.g.
<span class="fa fa-phone pe-color pe-small-icon" role=></span>

If the extension recognised, for instance, aria-hidden='true this would really save a lot of corrective development time.

I've tried adding roles to the spans, but this isn't necessarily a valid option.

[mvdschee]

He @HarryAdney I have implemented your request. With the latest update, you should not have any errors if you add aria-hidden="true" to your span