Fix #232 - ci badge linking MOODLE_404_STABLE

Author: x-iy

README.md

@@ -1,5 +1,4 @@
-![GitHub Workflow Status (branch)](https://img.shields.io/github/actions/workflow/status/catalyst/moodle-tool_trigger/ci.yml?branch=MOODLE_404_STABLE)
-
+[![ci](https://github.com/catalyst/moodle-tool_trigger/actions/workflows/ci.yml/badge.svg?branch=MOODLE_404_STABLE)](https://github.com/catalyst/moodle-tool_trigger/actions/workflows/ci.yml?branch=MOODLE_404_STABLE)
 
 # Event Trigger