Update README

Author: pierrechls

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="http://cdn.rawgit.com/pierrechls/web-midi-experiment/master/src/assets/images/web-midi-experiment.gif" style="width:100%;">
+  <img src="http://cdn.rawgit.com/pierrechls/web-midi-experiment/master/src/assets/images/web-midi-experiment-preview-resized.gif" style="width:100%;">
 </p>
 
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