Add support for Python 3.10

[Ch00k]

[codecov[bot]]

Codecov Report

Merging #61 (9f128c7) into master (1d54be1) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #61   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files           1        1           
  Lines          60       60           
=======================================
  Hits           58       58           
  Misses          2        2           

Impacted Files	Coverage Δ
ffmpy.py	96.66% <100.00%> (ø)

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