fix onClickShowModal

playground/src/containers/WelcomeScreen.js

   constructor(props) {
     super(props);
     this.onClickPush = this.onClickPush.bind(this);
-    this.onShowModal = this.onShowModal.bind(this);
+    this.onClickShowModal = this.onClickShowModal.bind(this);
   }
 
   render() {