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Backward-incompatible Changes
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- Removes `.as_list()` from `ImmutableSet`.
It is no longer needed since `ImmutableSet` extends `Sequence`. (`12 <https://github.com/isi-vista/immutablecollections/issues/12>`_)
New Features
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- Adds module-level factory methods for all collections (e.g. `immutableset(...)`).
These should be preferred over builders and `.of` methods. (`12 <https://github.com/isi-vista/immutablecollections/issues/12>`_)