Collections-extended

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* Fix bug when setting overlapping ranges (`GH 172`_)

.. _`GH 172`: https://github.com/mlenzen/collections-extended/issues/172

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* Added Python 3.10 to tests & classifiers
* Added equality testing to MappedRange (`GH 171`_)

.. _`GH 171`: https://github.com/mlenzen/collections-extended/issues/171

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* Drop support for Python 2.7, 3.4 & 3.5
* bags no longer inherit from Set
* can no longer compare as equal to Sets
* Rename and expose bag and set base classes
* `_basebag` -> :class:`Bag`
* `_basesetlist` -> :class:`SetList`
* tuples passed to the bijection constructor must have len == 2, not >= 2

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* Drop support for Python 2.6 & 3.3
* When multiplying bags, the cartesian product creates a tuple instead of adding
the elements.
* Added :class:`IndexedDict`
* Improve efficiency for large bag operations
* Add :meth:`setlist.swap`
* Add :meth:`bag.count`, :class:`CountsView` & :class:`UniqueElementsView`
* Add :meth:`bag.issubset` and :meth:`issuperset`
* Add support for Python 3.8
* Add :class:`Sentinel`
* Make :class:`MappedRange` a class instead of a namedtuple
* Add change log

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