Update README.md

Author: asteppke

README.md

@@ -1,9 +1,12 @@
-# tiny pid
+[![Pytest and Linter](https://github.com/asteppke/tinypid/actions/workflows/python-app.yml/badge.svg)](https://github.com/asteppke/tinypid/actions/workflows/python-app.yml)
+
+# Tiny PID
 Minimal PID controller in Python. 
 
-Optionally can use 
-- output limiting
-- anti-windup mechanism
-- lowpass filtering of derivative component
-- bumpless transfer between manual and automatic control
+Optional features: 
+- Output limiting
+- Anti-windup mechanism
+- Lowpass filtering of derivative component
+- Bumpless transfer between manual and automatic control
+- Gain scheduling