update changelog

Author: jessesquires

CHANGELOG.md

@@ -10,6 +10,8 @@ NEXT
 0.1.9
 -----
 
+This release closes the [0.1.9 milestone](https://github.com/jessesquires/ReactiveCollectionsKit/milestone/2?closed=1).
+
 - Fixed a (potential) bug where cells with the same name, but in different modules, would provide the same (conflicting) default `reuseIdentifier`. Default `reuseIdentifiers` now return the fully qualified type name. ([@jessesquires](https://github.com/jessesquires), [#150](https://github.com/jessesquires/ReactiveCollectionsKit/issues/150), [#154](https://github.com/jessesquires/ReactiveCollectionsKit/pull/154))
     - Previous behavior: `"MyCellClassName"`
     - New behavior: `"MyModuleName.MyCellClassName"`