Add speed definition to be able to use an emulator

motor.h

@@ -15,6 +15,7 @@ public:
     float maxSpeed () { return 10; }
     float acceleration () { return 5; }
     long distanceToGo () { return 0; }
+    float speed() {return 10;}
 };
 #else
 #include <AccelStepper.h>