Loading .ce files from older versions fails.

Hello, When I try to open my cluster expansion model files that I created with version 1.3 using version 2.0, it fails:

>>> ClusterExpansion.read('my_model.ce')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/mjwaters/.local/lib/python3.8/site-packages/icet-2.0-py3.8-linux-x86_64.egg/icet/core/cluster_expansion.py", line 344, in read
    items = pickle.load(tar_file.extractfile('items'))
ModuleNotFoundError: No module named 'icet.fitting'

I suspect this is due to CrossValidationEstimator moving to trainstation which is making the pickled .ce files incompatible.

Is there a work around for this? Or should I continue using v1.3?