Implement container.commit() command

[asvetlov]

No description provided.

[codecov]

Codecov Report

Merging #418 into master will decrease coverage by 0.08%.
The diff coverage is 84.00%.

@@            Coverage Diff             @@
##           master     #418      +/-   ##
==========================================
- Coverage   87.54%   87.45%   -0.09%     
==========================================
  Files          21       21              
  Lines        1172     1196      +24     
==========================================
+ Hits         1026     1046      +20     
- Misses        146      150       +4     

Impacted Files	Coverage Δ
aiodocker/containers.py	87.72% <84.00%> (-0.54%)	⬇️

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