defaultdict 0.19.0

A hashmap implementation that mirrors the python defaultdict.
Documentation 
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# Motivation
This serves as an utility library and an example project. It has no dependencies
so it can be used in a different project without pulling in other dependencies transitively.

# Description

This library exposes structs that mimicks the behaviour of the python
[defaultdict](https://docs.python.org/3/library/collections.html#collections.defaultdict).

This behaviour does require that the type of the value does have the [Default](https://doc.rust-lang.org/std/default/trait.Default.html) implemented.