Update breaking-changes.md

breaking-changes.md

@@ -5,6 +5,7 @@
 - Touch events on Android now have coordinates consistent with iOS: [0c2ee5](https://github.com/facebook/react-native/commit/0c2ee5d480e696f8621252c936a8773e8de9f8b6)
 - YellowBox enabled by default: [8ab518](https://github.com/facebook/react-native/commit/8ab51828ff077ae0ad10c06f62f9f01d58b9bf85)
 - React Native now uses Babel 6 (props to tadeuzagallo for upgrading!). We've been using React Native with Babel 6 at Facebook for quite a while now. Nevertheless, please report any errors related to Babel, such as transforms for some JS features not working as expected and we'll fix them.
+- Decorators won't work until [T2645](https://phabricator.babeljs.io/T2645) lands in Babel.
 
 ## 0.15