update README

README.md

@@ -8,7 +8,7 @@
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 ### Demo<a name="demo"></a> 
-[![IMAGE ALT TEXT](http://img.youtube.com/vi/YOUTUBE_VIDEO_ID_HERE/0.jpg)](https://youtu.be/cjoVE7d1JXY "ensync WIP Demo")
+[![IMAGE ALT TEXT](http://img.youtube.com/vi/cjoVE7d1JXY/0.jpg)](https://youtu.be/cjoVE7d1JXY "ensync WIP Demo")
 
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