Add a 'Date reviewed' field to techniques and failures

Hi all,

On the call today, it was suggested that this proposal to add a 'Date 
Approved' field to Techs and Failures
be tweaked to be 'Date reviewed'. [1]

How does the group feel about this? The consensus on the call was that 
it was a good idea, was relatively easy to
do technically and would help our users see that work is ongoing with 
our supporting materials.

Let us know what you think.

Thanks

Josh

[1] https://github.com/w3c/wcag/issues/183