Update SpecData CSS Logical Properties URL (#951)
Update SpecData CSS Logical Properties URL (#951)

This change makes https://drafts.csswg.org/css-logical/ be used by
SpecData.json as the URL for the CSS Logical Properties and Values
spec, because https://drafts.csswg.org/css-logical-props/ now redirects
to that URL.
a2sheppy/kumascript,jpmedley/kumascript,jpmedley/kumascript,a2sheppy/kumascript