- Update to 2.1.0:
* Small updates to docs and tests for Python 3.7.
* Change imports for Abstract Base Classes to collections.abc to avoid warnings in Python 3.7.
* SortedDict methods iterkeys, iteritems, itervalues, viewkeys, viewitems, and viewvalues are not implemented for Python 2. Attribute lookup now raises :exc:`AttributeError`.
* Accessing SortedDict.iloc will emit DeprecationWarning.
* SortedSet.__rsub__ erroneously reversed its arguments. The method has been removed in favor of the inherited Set.__rsub__ which has a correct implementation.
* :class:`SortedKeysView` and :class:`SortedValuesView` set-operations now return :class:`SortedSet` objects to better match the semantics of version 1.
- use github tarball for tests