Refresh the README badges

Signed-off-by: Sergey Vasilyev <[email protected]>

README.md

@@ -1,12 +1,10 @@
 # Kubernetes Operator Pythonic Framework (Kopf)
 
+[![GitHub](https://img.shields.io/github/stars/nolar/kopf?style=flat&label=GitHub%E2%AD%90%EF%B8%8F)](https://github.com/nolar/kopf)
+[![CI](https://github.com/nolar/kopf/actions/workflows/thorough.yaml/badge.svg)](https://github.com/nolar/kopf/actions/workflows/thorough.yaml)
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 **Kopf** —Kubernetes Operator Pythonic Framework— is a framework and a library
 to make Kubernetes operators development easier, just in a few lines of Python code.
@@ -19,6 +17,12 @@ The project was originally started as `zalando-incubator/kopf` in March 2019,
 and then forked as `nolar/kopf` in August 2020: but it is the same codebase,
 the same packages, the same developer(s).
 
+As of now, the project is in maintenance mode since approximately mid-2021:
+Python, Kubernetes, CI tooling, dependencies are upgraded, new bugs are fixed,
+but no new big features are added — there is nothing to add to this project
+without exploding its scope beyond the "operator framework" definition 
+(ideas are welcome!).
+
 
 ## Documentation