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Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the solution you'd like
Please add generics to frozendict
One should be able to define frozendict key and value types like so:

>>> import frozendict
>>> f = frozendict.frozendict[str, int]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'type' object is not subscriptable

this works

>>> import typing
>>> f = typing.Dict[str, int]

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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Related:

• Generics? slezica/python-frozendict#27
• Generics? corenting/immutabledict#41