Add support to Python 3.10

[lfvilella]

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[codecov-commenter]

Codecov Report

Merging #47 (155465b) into master (281f602) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #47   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files           7        7           
  Lines         246      246           
=======================================
  Hits          230      230           
  Misses         16       16           

Impacted Files	Coverage Δ
pydantic2graphene/version.py	100.00% <100.00%> (ø)

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