[CSSWG][css-fonts] Updated WD of CSS Fonts Level 4

The CSS WG has published an updated Working Draft of the CSS Fonts Module Level 4:

    https://www.w3.org/TR/css-fonts-4

This module defines new features regarding variable fonts, font loading timeline configuration, and color fonts support.

Significant changes are listed at:

  https://www.w3.org/TR/2017/WD-css-fonts-4-20170711/

Please review the draft, and send any comments to this mailing list,
<www-style@w3.org>, prefixed with [css-fonts] (as I did on this
message) or (preferably) file them in the GitHub repository at
  https://github.com/w3c/csswg-drafts/issues

For the CSS WG,
Myles C. Maxfield