(README) update badge (#68)

Author: MatthijsBurgh

README.md

@@ -1,6 +1,6 @@
 # ED Sensor integration
 
-[![CI](https://github.com/tue-robotics/ed_sensor_integration/workflows/CI/badge.svg)](https://github.com/tue-robotics/ed_sensor_integration/actions)
+[![CI](https://github.com/tue-robotics/ed_sensor_integration/actions/workflows/main.yml/badge.svg)](https://github.com/tue-robotics/ed_sensor_integration/actions/workflows/main.yml)
 
 Plugins for integrating sensor data into ED, e.g. Lidar, RGBD