Update README.md to show test button for unit-tests.yml

Author: ddasilva

README.md

@@ -1,5 +1,5 @@
 ![Python 3.8 | 3.9 | 3.10](https://img.shields.io/badge/python-3.8_|_3.9|_3.10-blue)
-[![Tests](https://github.com/suncet/suncet_processing_pipeline/actions/workflows/tests.yml/badge.svg)](https://github.com/suncet/suncet_processing_pipeline/actions/workflows/tests.yml)
+[![Tests](https://github.com/suncet/suncet_processing_pipeline/actions/workflows/tests.yml/badge.svg)](https://github.com/suncet/suncet_processing_pipeline/actions/workflows/unit-tests.yml)
 
 # SunCET Data Processing Pipeline