Immutablecollections

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New Features
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- - adds an *inverse* method to `ImmutableDict` (`75 <https://github.com/isi-vista/immutablecollections/issues/75>`_)

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No significant changes.

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New Features
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- `ImmutableSet` now implements the same methods as the standard library `frozenset`. Added the `issubset`, `issuperset`, and `symmetric_difference` convenience methods that wrap `<=`, `>=`, and `^`, respectively, and the shallow `copy` method. (`61 <https://github.com/isi-vista/immutablecollections/issues/61>`_)


Bug Fixes
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- Slicing of `ImmutableSet`s that only contain a single element is implemented. (`23 <https://github.com/isi-vista/immutablecollections/issues/23>`_)

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New Features
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- Add workarounds for mypy problems with attrs type converters and generics. This is to workaround python/mypy5738 and python-attrs/attrs519 . (`59 <https://github.com/isi-vista/immutablecollections/pull/59>`_)

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Backward-incompatible Changes
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- `ImmutableList` has been removed in favor of `tuple`. Now that we are no longer targeting support for runtime type-checking of collections, `ImmutableList` had no advantage over `tuple` for any purpose. (`42 <https://github.com/isi-vista/immutablecollections/issues/42>`_)


Bug Fixes
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- immutableset can now be created from KeysView, ItemsView if dict iteration is deterministic. (`35 <https://github.com/isi-vista/immutablecollections/issues/35>`_)

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New Features
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- ImmutableDict supports equality comparison with `dict`.
ImmutableSet supports equality comparison with `set` and `frozenset`. (`33 <https://github.com/isi-vista/immutablecollections/issues/33>`_)