Coveralls badge (#16)

.github/workflows/pytest.yml

@@ -54,5 +54,5 @@ jobs:
       run: |
         poetry run coverage run -m pytest -s -m mock_llm
 
-    - name: Coveralls
+    - name: Upload coverage to Coveralls
       uses: coverallsapp/github-action@v2

README.md

@@ -4,6 +4,7 @@
 [![Issues](https://img.shields.io/github/issues/metauto-ai/GPTSwarm?color=00afaa)](https://github.com/metauto-ai/gptswarm/issues)
 [![Twitter Follow](https://img.shields.io/twitter/follow/AI_KAUST?style=social)](https://twitter.com/AI_KAUST)
 [![Wechat](https://img.shields.io/badge/Wechat-7BB32E?logo=wechat&logoColor=white)](https://metauto.ai/images/wechat.jpeg)
+[![Coverage Status](https://coveralls.io/repos/github/metauto-ai/GPTSwarm/badge.svg?branch=coveralls)](https://coveralls.io/github/metauto-ai/GPTSwarm?branch=coveralls)
 
 <p align="left">
 <a href=""><img src="swarm/utils/assets/logo.png" alt="GPTSwarm" width="430px"></a>