Merge pull request #283 from Domiii/patch-1

added codepen link for first README example

Author: ellbee

README.md

@@ -9,6 +9,8 @@ Simple “selector” library for Redux (and others) inspired by getters in [Nuc
 * Selectors are efficient. A selector is not recomputed unless one of its arguments changes.
 * Selectors are composable. They can be used as input to other selectors.
 
+You can play around with the following **example** in [this codepen](https://codepen.io/Domiii/pen/LzGNWj?editors=0010):
+
 ```js
 import { createSelector } from 'reselect'