fix from perfection cat (sindra1961), update for API changes.

mesh_bsurfaces.py

@@ -825,8 +825,8 @@ def register():
     bpy.types.Scene.SURFSK_precision = bpy.props.IntProperty(name="Precision", description="Precision level of the surface calculation", default=4, min=0, max=100000)
     bpy.types.Scene.SURFSK_keep_strokes = bpy.props.BoolProperty(name="Keep strokes", description="Keeps the sketched strokes after adding the surface", default=False)
 
-    keymap_item_add_surf = bpy.data.window_managers[0].keyconfigs.active.keymaps["3D View"].items.new("gpencil.surfsk_add_surface","E","PRESS", key_modifier="D")
-    keymap_item_stroke_to_curve = bpy.data.window_managers[0].keyconfigs.active.keymaps["3D View"].items.new("gpencil.surfsk_strokes_to_curves","C","PRESS", key_modifier="D")
+    keymap_item_add_surf = bpy.data.window_managers[0].keyconfigs.active.keymaps["3D View"].keymap_items.new("gpencil.surfsk_add_surface","E","PRESS", key_modifier="D")
+    keymap_item_stroke_to_curve = bpy.data.window_managers[0].keyconfigs.active.keymaps["3D View"].keymap_items.new("gpencil.surfsk_strokes_to_curves","C","PRESS", key_modifier="D")
     
 
 def unregister():
@@ -840,12 +840,12 @@ def unregister():
     del bpy.types.Scene.SURFSK_keep_strokes
     
     km = bpy.data.window_managers[0].keyconfigs.active.keymaps["3D View"]
-    for kmi in km.items:
+    for kmi in km.keymap_items:
         if kmi.idname == 'wm.call_menu':
             if kmi.properties.name == "GPENCIL_OT_SURFSK_add_surface":
-                km.items.remove(kmi)
+                km.keymap_items.remove(kmi)
             elif kmi.properties.name == "GPENCIL_OT_SURFSK_strokes_to_curves":
-                km.items.remove(kmi)   
+                km.keymap_items.remove(kmi)   
             else:
                 continue