update changelog

sokil · Dec 30, 2014 · 8234ec6 · 8234ec6
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 ## 1.11.2 (2014-12-29)
   * `AggragetePipelines` class renamed to `Pipeline`. If you in some reason use it directly, use factory method `Collection::greateAggregator()` instead
+  * Added some aggregation group accumulators and expressions
+  * Query builder's expression may be configured in mapping
 
 ## 1.11.1 (2014-12-21)