chore: Adding pi deps

musikautomat/requirements.txt

@@ -5,6 +5,7 @@ pkg-resources==0.0.0
 pygame==2.0.0.dev6
 python-magic==0.4.15
 PyYAML==5.1.2
+RPi.GPIO==0.7.0
 six==1.13.0
 tornado==6.0.3
 typed-ast==1.4.0