applications.md in h3-3.7.1

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 The following applications use H3. Contributions to this list are welcome, please feel free to open a [pull request](https://github.com/uber/h3/tree/master/docs/community/applications.md).
 
 ## Visualization
 
 - [kepler.gl](http://kepler.gl/) - An open source geospatial analysis tool
+- [pydeck](https://pydeck.gl/) - High-scale spatial rendering in Python, powered by deck.gl