Fix broken link in Overview.md (facebookarchive#2062)

Summary:
**Summary**

fixed the broken link on the documentation

**Test Plan**
.
Pull Request resolved: facebookarchive#2062

Differential Revision: D15146390

Pulled By: claudiopro

fbshipit-source-id: 31450d24a5326025b3fa7ffb9c142f1ccfa4fba3

docs/Overview.md

@@ -8,7 +8,7 @@ Draft.js is a framework for building rich text editors in React, powered by an i
 
 Draft.js makes it easy to build any type of rich text input, whether you're just looking to support a few inline text styles or building a complex text editor for composing long-form articles.
 
-Draft.js was introduced at [React.js Conf](http://conf.reactjs.com/) in February 2016.
+Draft.js was introduced at [React.js Conf](https://conf2016.reactjs.org/schedule.html#rich-text-editing-with-react) in February 2016.
 
 <iframe width="650" height="365" src="https://www.youtube.com/embed/feUYwoLhE_4" frameborder="0" allowfullscreen></iframe>