Converting old python script to work in Blender 2.80

Question

I'm trying to convert a python script to work in Blender 2.8 https://github.com/mtyka/attractor/blob/c7edbadcee826ea5d791529cfa329f2c326215ec/attractor.py

I've made the changes to line 27 to say "blender": (2, 80, 0),

but I'm getting errors in line 384 in addon_utils.py which this file doesn't exist on my system (I have 2.79 and 2.80 snap blender Ubuntu 18.04 64bit neither have this file).

and I'm getting errors in line 1480 in attractor.py

def register():
  bpy.utils.register_module(__name__)
  bpy.types.INFO_MT_curve_add.append(menu_func)