update CHANGELOG.md

Author: Bart Arribe

CHANGELOG.md

@@ -1,3 +1,10 @@
+- [1.5.12]
+  + Update core packages
+  + Optionally disable the 'next' control button (thanks [@SSTPIERRE2](https://github.com/SSTPIERRE2))
+  + Fix `Uncaught TypeError: _this.refs.scrollView.scrollTo is not a function` (thanks [@flyskywhy](https://github.com/flyskywhy))
+  + Allow dotStyle and activeDotStyle PropTypes to accept Stylesheet (thanks [@knopt](https://github.com/knopt))
+  + Calculate the offset in the initial state instead of `onLayout` (thanks [@kjkta](https://github.com/kjkta))
+
 - [1.5.11]
   + Typescript Definition