add python 3.10 to version matrix

[kaczmarj]

No description provided.

[codecov]

Codecov Report

Merging #436 (2400a41) into master (78ed3ce) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #436      +/-   ##
==========================================
+ Coverage   88.56%   88.57%   +0.01%     
==========================================
  Files          11       11              
  Lines        1014     1015       +1     
==========================================
+ Hits          898      899       +1     
  Misses        116      116              

Impacted Files	Coverage Δ
neurodocker/cli/generate.py	90.99% <0.00%> (+0.04%)	⬆️

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