abandon attemptProgress, use computed porterty instead
abandon attemptProgress, use computed porterty instead

66eli77/kolibri-exercise-perseus-plugin,learningequality/kolibri-exercise-perseus-plugin,christianmemije/kolibri-exercise-perseus-plugin,66eli77/kolibri-exercise-perseus-plugin,66eli77/kolibri-exercise-perseus-plugin,christianmemije/kolibri-exercise-perseus-plugin,learningequality/kolibri-exercise-perseus-plugin,christianmemije/kolibri-exercise-perseus-plugin