Readme: updated badges

README.md

@@ -1,6 +1,7 @@
 [![License](https://img.shields.io/badge/license-MIT-blue.svg)](http://choosealicense.com/licenses/mit/)
-[![Repo Status](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip)
+[![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)
 ![example workflow](https://github.com/nhjschulz/cfsm/actions/workflows/cmake-single-platform.yml/badge.svg)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/nhjschulz/library/CFSM.svg)](https://registry.platformio.org/libraries/nhjschulz/CFSM)
 
 # CFSM -  A State Pattern Approach for C-Programs