Merge pull request #548 from PhilipOakley/patch-7

add 'Rev News' note to the top level README page

Author: chriscool

_includes/README.md

@@ -16,6 +16,9 @@ It is meant to be edited collaboratively like a wiki, except that
 instead of a web form, you get to use a text editor and Git. What could
 be better?
 
+These pages also host the [Git Rev News](https://git.github.io/rev_news/),
+see the [About Git Rev News](https://git.github.io/rev_news/rev_news/) page.
+
 If you want push access, contact [email protected] and provide your GitHub
 username. You may also send patches by mail (and feel free to cc
 [email protected] if appropriate).