Fix readme notice about CLI versioning

Author: cmaglie

Diff for: docs/index.md

@@ -19,8 +19,7 @@ services and messages are detailed in the [gRPC reference] pages.
 
 ## Versioning and backward compatibility policy
 
-This software is currently under active development: anything can change at any time, API and UI must be considered
-unstable until we release version 1.0.0. For more information see our [versioning and backward compatibility] policy.
+The Arduino CLI is in the stable production release 1.x.x. All API (JSON and gRPC) stable, any possible new breaking change will be delayed until the next major release. For more information see our [versioning and backward compatibility] policy.
 
 [installation]: installation.md
 [getting started guide]: getting-started.md