Update ToC

bkrem · bkrem · commit 4861a8a82a26 · 2017-06-01T23:01:33.000+02:00
diff --git a/README.md b/README.md
@@ -11,6 +11,7 @@ React D3 Tree is a [React](http://facebook.github.io/react/) component that lets
 - [Installation](#installation)
 - [Minimal example](#minimal-example)
 - [Props](#props)
+- [External data sources](#external-data-sources)
 
 
 ## Demo
