update readme for current environment manager support

Author: eleanorjboyd

README.md

@@ -63,6 +63,8 @@ The following environment managers are supported out of the box:
 
 Environment managers are responsible for specifying which package manager will be used by default to install and manage Python packages within the environment (`venv` uses `pip` by default). This ensures that packages are managed consistently according to the preferred tools and settings of the chosen environment manager.
 
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 ### Package Management
 
 The extension also provides an interface to install and uninstall Python packages, and provides APIs for extension developers to contribute package managers of their choice.