CI: Add missing Arduino Lint badge to README. (#6)

Author: aentinger

README.md

@@ -2,6 +2,8 @@ AdvancedAnalogRedux 〰
 ======================
 [![Spell Check status](https://github.com/bcmi-labs/AdvancedAnalogRedux/actions/workflows/spell-check-task.yml/badge.svg)](https://github.com/bcmi-labs/AdvancedAnalogRedux/actions/workflows/spell-check-task.yml)
 [![Sync Labels status](https://github.com/bcmi-labs/AdvancedAnalogRedux/actions/workflows/sync-labels.yml/badge.svg)](https://github.com/bcmi-labs/AdvancedAnalogRedux/actions/workflows/sync-labels.yml)
+[![Arduino Lint](https://github.com/bcmi-labs/AdvancedAnalogRedux/workflows/Arduino%20Lint/badge.svg)](https://github.com/bcmi-labs/AdvancedAnalogRedux/actions?workflow=Arduino+Lint)
+
 
 Advanced Analog Library