Add Spero for Cancer to React Native showcase

Author: tylermcginnis

website/src/react-native/showcase.js

@@ -162,6 +162,12 @@ var apps = [
     link: 'https://itunes.apple.com/us/app/youmeyou/id949540333?mt=8',
     author: 'youmeyou, LLC',
   },
+  {
+    name: 'Spero for Cancer',
+    icon: 'https://s3-us-west-1.amazonaws.com/cancerspot/site_images/Spero1024.png',
+    link: 'https://geo.itunes.apple.com/us/app/spero-for-cancer/id1033923573?mt=8',
+    author: 'Spero.io',
+  },
 ];
 
 var showcase = React.createClass({