:books: docs: add GraphicsMagick to prerequisite list
:books: docs: add GraphicsMagick to prerequisite list
andrewburgess/space-bucket-pi,Aaronik/space-bucket-pi,andrewburgess/space-bucket-pi,Aaronik/space-bucket-pi,Aaronik/space-bucket-pi,andrewburgess/space-bucket-pi