v0.3.0

• Adds group_by for creating a dictionary from an iterable where a single key maps to a list of values. Comparable to itertools.groupby, but doesn't require pre-sorting the iterable.

v0.2.0

• Adds flattened_items, for creating creating flattened a (key, value) iterable for a dictionary where keys contain iterables
• Adds invert_dict

v0.1.0

Initial release

• map_keys and map_values added