Update CHANGELOG

Aleksey Danilevskiy · Aleksey Danilevskiy · commit 53e56a1fb053 · 2019-09-30T18:47:08.000+03:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 0.4.1
+* class `Set` of aggregation stages moved to class `SetStage` to resolve conflict with `dart:core` library
+ 
 ## 0.4.0 - September 30th, 2019 (@alexd1971, @vadimtsushko)
 * Aggregation pipeline builder [PR#14](https://github.com/mongo-dart/mongo_dart_query/pull/14)
 
