update readme

Signed-off-by: Mohammad Mazraeh <[email protected]>

Author: MohMaz

python/samples/core_distributed-group-chat/README.md

@@ -10,7 +10,7 @@ This example runs a gRPC server using [GrpcWorkerAgentRuntimeHost](../../src/aut
 2. Install dependencies.
 
 ```bash
-pip install "autogen-ext[openai,azure,chainlit,rich,pyyaml]"
+pip install "autogen-ext[openai,azure,rich]>=0.4.5" chainlit pyyaml
 ```
 
 ### General Configuration