Mention parse a selector in use cases

Author: zcorpan

css-parser-api/readme.md

@@ -11,8 +11,9 @@ Current Use Cases
 * Be able to pass the following in to the parser and get
 a representative object in return
     * property and value
+    * selector (see [bug 24115](https://www.w3.org/Bugs/Public/show_bug.cgi?id=24115))
     * css rule
     * full stylesheet
 * Be able to turn off/on error handling which will enable
 the capability to use the parser for custom language needs
-or CSS polyfilling.
+or CSS polyfilling.