CLOUDP-114684: Update README to include atlascli v1.0.0 (#1042)

Author: andreaangiolillo

atlascli.md

@@ -1,13 +1,11 @@
-# Atlas CLI (Pre-Release)
+# Atlas CLI
 
 The MongoDB Atlas CLI is a modern command line interface that enables you to manage MongoDB Atlas from the terminal.
 
 ![atlascli-atlas-quickstart](https://user-images.githubusercontent.com/5663078/156184669-57c8ddce-6f0a-4e84-9311-2d996cb27942.gif)
 
 ## Installing
 
-Atlas CLI is currently in the pre-release phase. Do not use it in a production environment.
-
 ### Pre-built Binaries
 
 Download the appropriate version for your platform from [Atlas CLI releases](https://github.com/mongodb/mongocli/releases).