Update changelog

Author: pjm17971

CHANGES.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## v0.12.5
+> Jun 15, 2017
+
+ * Fixes propType warnings by using prop-types package(([@aruntk](https://github.com/aruntka) in [#152](https://github.com/esnet/react-timeseries-charts/pull/152))
+ * Fixes an issue with ScatterChart prop type (([@christian-acuna](https://github.com/christian-acuna) in [#155](https://github.com/esnet/react-timeseries-charts/pull/155))
+ * Pointer events allowing on ScatterChart (([@samford100](https://github.com/samford100) in [#137](https://github.com/esnet/react-timeseries-charts/pull/137))
+
 ## v0.12.3
 > Feb 24, 2017