bug with ctapipe==0.12

[garciagenrique]

(hipe_update_lstv096_with-v096) ➜  hipe_update_v096  mchdf5_simtel2r0 -i proton_20deg_180deg_run1___cta-prod3-demo-2147m-LaPalma-baseline-mono.simtel.gz -o proton_20deg_180deg_run1_ctapipev012.h5
Traceback (most recent call last):
  File "/Users/garciaenrique/miniconda3/envs/hipe_update_lstv096_with-v096/bin/mchdf5_simtel2r0", line 5, in <module>
    from ctapipe_io_mchdf5.converter.mchdf5_simtel2r0 import main
  File "/Users/garciaenrique/miniconda3/envs/hipe_update_lstv096_with-v096/lib/python3.8/site-packages/ctapipe_io_mchdf5/converter/mchdf5_simtel2r0.py", line 11, in <module>
    from ctapipe.io import event_source
ImportError: cannot import name 'event_source' from 'ctapipe.io' (/Users/garciaenrique/miniconda3/envs/hipe_update_lstv096_with-v096/lib/python3.8/site-packages/ctapipe/io/__init__.py)