Fix maintenance status phrasing

/issue #44

README.md

@@ -4,7 +4,7 @@ A Python package for operating cross region Amazon Web Services (AWS) resources.
 
 ## Status
 
-![Lifecycle: sunset](https://img.shields.io/badge/lifecycle-sunset-blue.svg) ![Support: unsupported](https://img.shields.io/badge/support-unsupported-yellow.svg) ![Maintenance: maintained](https://img.shields.io/badge/maintenance-maintained-green.svg)
+![Lifecycle: sunset](https://img.shields.io/badge/lifecycle-sunset-blue.svg) ![Support: unsupported](https://img.shields.io/badge/support-unsupported-yellow.svg) ![Maintenance: passive](https://img.shields.io/badge/maintenance-passive-green.svg)
 
 This project is being sunsetted and is no longer supported.
 * the project's goals have been mostly obsoleted by the excellent [AWS Command Line Interface (AWS CLI)](https://github.com/aws/aws-cli) - remaining unique functionality should probably be implemented as an AWS CLI plugin, see [botocross/issues/44](https://github.com/sopel/botocross/issues/44) for details