Cloudpickle

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- Fixed a pickling issue for ABC in python3.7+ ([issue 180](
https://github.com/cloudpipe/cloudpickle/issues/180)).

- Fixed a bug when pickling functions in `__main__` that access global
variables ([issue 187](
https://github.com/cloudpipe/cloudpickle/issues/187)).

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- Fixed a crash in Python 2 when serializing non-hashable instancemethods of built-in
types ([issue 144](https://github.com/cloudpipe/cloudpickle/issues/144)).

- itertools objects can also pickled
([PR 156](https://github.com/cloudpipe/cloudpickle/pull/156)).

- `logging.RootLogger` can be also pickled
([PR 160](https://github.com/cloudpipe/cloudpickle/pull/160)).

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- Fixed a regression: `AttributeError` when loading pickles that hold a
reference to a dynamically defined class from the `__main__` module.
([issue 131]( https://github.com/cloudpipe/cloudpickle/issues/131)).

- Make it possible to pickle classes and functions defined in faulty
modules that raise an exception when trying to look-up their attributes
by name.

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- Fixed `cloudpickle.__version__`.

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- Use `pickle.HIGHEST_PROTOCOL` by default.

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- `logging.RootLogger` can be also pickled
([PR 160](https://github.com/cloudpipe/cloudpickle/pull/160)).