Clean up readme

README.md

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 This projects demonstrates how [Vega](vega.github.io/vega) and [Vega-Lite](vega.github.io/vega-lite) can be used in custom visuals in PowerBI. This custom visual is not intended for daily use. Think of it as a hello world for Vega and Vega-Lite in PowerBI custom visuals.
 
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 ![Screenshot](screenshot.png)
 
 ## Install