fix: import Mapping from typing module #57
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Panphon > 0.20.0 is currently failing on python 3.8
in python 3.8 you cannot subscript the
collections.abc.Mapping
class so importing fromtyping
is more stable across python versions.see https://stackoverflow.com/questions/59955751/abcmeta-object-is-not-subscriptable-when-trying-to-annotate-a-hash-variable