docs: fix ci badge

Author: Neverdecel

README.md

@@ -2,7 +2,7 @@
 
 [![Python 3.11+](https://img.shields.io/badge/python-3.11+-blue.svg)](https://www.python.org/downloads/)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
-[![CI Tests](https://github.com/Neverdecel/CodeRAG/actions/workflows/ci-tests.yml/badge.svg?branch=main)](https://github.com/Neverdecel/CodeRAG/actions/workflows/ci-tests.yml)
+[![CI Tests](https://github.com/Neverdecel/CodeRAG/actions/workflows/ci-tests.yml/badge.svg?branch=master)](https://github.com/Neverdecel/CodeRAG/actions/workflows/ci-tests.yml)
 
 > **Note**: This POC was innovative for its time, but modern tools like Cursor and Windsurf now apply this principle directly in IDEs. This remains an excellent educational project for understanding RAG implementation.