Tweak to the jsext listing

Author: jducoeur

index.md

@@ -124,7 +124,7 @@ All these testing frameworks cross-compile on the JVM and JS.
 
 * [Scala-Async](https://github.com/scala/async) (works out-of-box with Scala.js)
 * Scalaxy [Loops](https://github.com/ochafik/Scalaxy/tree/master/Loops) and [Streams](https://github.com/ochafik/Scalaxy/tree/master/Streams) (work out-of-box with Scala.js)
-* [jsext](https://github.com/jducoeur/jsext): utilities for developing facades
+* [jsext](https://github.com/jducoeur/jsext): utilities for developing facades and working with Futures
 
 ## Skeletons