Added link to the zcheck testing framework.

Author: betehess

index.md

@@ -82,6 +82,7 @@ All these testing frameworks cross-compile on the JVM and JS.
 * [MiniTest](https://github.com/monifu/minitest)
 * [Little Spec](https://github.com/eecolor/little-spec)
 * [Nyaya](https://github.com/japgolly/nyaya): Property testing and related.
+* [zcheck](https://github.com/InTheNow/zcheck): A wrapper around scalacheck and scalaz's Speclite.
 
 ### HTML templating libraries