20200518

• Fix: Add an __iter__ method to python iterators.
  (Fixed by Laurent Mazare, #47)

• Add Py.Seq.{of_seq_map, to_seq_map, unsafe_to_seq_map, of_list, of_list_map} functions.

• Remove Py.Import.cleanup, which has been removed from Python 3.9, and was marked "for internal use only" before.
  (Reported by Victor Stinner, #49)

• Fix: memory leak in pyml_wrap_closure
  (Fixed by Laurent Mazare, #53)

• Add Py.Module.set_docstring, for Python >=3.5.
  (Added by Laurent Mazare, #54)

• Fix: install .cmx files
  (Reported by Jonathan Laurent, #55)