readme: mention support for Selectors Level 3 spec

eush77 · eush77 · commit 47e0bec2d11c · 2015-12-27T01:26:08.000+03:00
diff --git a/README.md b/README.md
@@ -46,6 +46,10 @@ That's it!
 
 ## Features
 
+All the relevant parts of [Selectors Level 3][spec]:
+
+[spec]: http://www.w3.org/TR/css3-selectors/
+
 - [x] Type selectors: `paragraph`
 - [x] Descendant selectors: `paragraph text`
 - [x] Child selectors: `paragraph > text`
