Update README.md

Author: wagslane

README.md

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 # Bootdev CLI
 
-This is a command line tool for [Boot.dev](https://www.boot.dev) that allows you to submit lessons and do other such nonsense.
+The official command line tool for [Boot.dev](https://www.boot.dev). It allows you to submit lessons and do other such nonsense.
 
 ⭐ Hit the repo with a star if you're enjoying Boot.dev ⭐