deleted: lesson_04/basics.py

	deleted:    lesson_04/mover.py
	renamed:    lesson_04/step_3.py -> lesson_04/node.py
	deleted:    lesson_04/square.py
	deleted:    lesson_04/step_0.py
	deleted:    lesson_04/step_1.py
	deleted:    lesson_04/step_2.py
	modified:   setup.py