Update README.md

Author: mythz

README.md

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 ServiceStack's **Add ServiceStack Reference** feature allows clients to generate Native Types from directly within PyCharm using [ServiceStack IntelliJ Plugin](https://plugins.jetbrains.com/plugin/7749-servicestack/) - providing a simple way to give clients typed access to your ServiceStack Services.
 
-<iframe width="896" height="525" src="https://www.youtube.com/embed/WjbhfH45i5k" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
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+[![](https://docs.servicestack.net/images/servicestack-reference/python-add-servicestack-reference-youtube-splash.png)](https://youtu.be/WjbhfH45i5k)
 
 ### First class development experience