remove downloads badge to avoid rate limit

Author: teticio

README.md

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 # Python Envy
 
 [![Visual Studio Marketplace Installs](https://img.shields.io/visual-studio-marketplace/i/teticio.python-envy?style=flat-square)](https://marketplace.visualstudio.com/items?itemName=teticio.python-envy)
-[![Visual Studio Marketplace Downloads](https://img.shields.io/visual-studio-marketplace/d/teticio.python-envy?style=flat-square)](https://marketplace.visualstudio.com/items?itemName=teticio.python-envy)
 
 Automatically activate Python virtual environments as you navigate the source code.