Clarify the change log

Author: pygy

HISTORY.md

@@ -29,6 +29,8 @@
 - Prefixed at-rules are treated like their unprefixed counterparts.
 - Added the `at()`, `global()` and `kv()` helpers.
 - Added `@local` as a counterpart to `@global`.
+- `& > &` with a selector list as parent will perform their cartesian product
+  like SASS and LESS do.
 - 2.2Kb mingzipped (+ ~500 bytes).
 
 ## v0.11.1 (2016-03-8)