Add muesli/termenv (#3685)

README.md

@@ -292,6 +292,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 * [tabular](https://github.com/InVisionApp/tabular) - Print ASCII tables from command line utilities without the need to pass large sets of data to the API.
 * [termbox-go](https://github.com/nsf/termbox-go) - Termbox is a library for creating cross-platform text-based interfaces.
 * [termdash](https://github.com/mum4k/termdash) - Go terminal dashboard based on **termbox-go** and inspired by [termui](https://github.com/gizak/termui).
+* [termenv](https://github.com/muesli/termenv) - Advanced ANSI style & color support for your terminal applications
 * [termui](https://github.com/gizak/termui) - Go terminal dashboard based on **termbox-go** and inspired by [blessed-contrib](https://github.com/yaronn/blessed-contrib).
 * [uilive](https://github.com/gosuri/uilive) - Library for updating terminal output in realtime.
 * [uiprogress](https://github.com/gosuri/uiprogress) - Flexible library to render progress bars in terminal applications.