increase demo embed height

//cc @kvz

website/src/_posts/2019-03-0.30.md

@@ -28,7 +28,7 @@ Uppy is developed by [Transloadit](https://transloadit.com). Transloadit is the
 Here’s a demo:
 
 <div class="wide">
-  <p class="codepen" data-height="407" data-theme-id="light" data-default-tab="js,result" data-user="uppy" data-slug-hash="gEgPav" style="height: 400px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid black; margin: 1em 0; padding: 1em;" data-pen-title="Robodog: resizing and optimizng your avatar">
+  <p class="codepen" data-height="600" data-theme-id="light" data-default-tab="js,result" data-user="uppy" data-slug-hash="gEgPav" style="height: 600px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid black; margin: 1em 0; padding: 1em;" data-pen-title="Robodog: resizing and optimizng your avatar">
     <span>See the Pen <a href="https://codepen.io/uppy/pen/gEgPav/">
     Robodog: resizing and optimizng your avatar</a> by Uppy File Uploader (<a href="https://codepen.io/uppy">@uppy</a>)
     on <a href="https://codepen.io">CodePen</a>.</span>