use classmethod to instantiate

[narumiruna]

No description provided.

[codecov]

Codecov Report

Merging #56 (2bb87b0) into main (5ba406e) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   93.77%   93.91%   +0.13%     
==========================================
  Files           7        7              
  Lines         305      312       +7     
==========================================
+ Hits          286      293       +7     
  Misses         19       19              

Impacted Files	Coverage Δ
mlconfig/config.py	86.73% <100.00%> (+0.27%)	⬆️
tests/test_config.py	100.00% <100.00%> (ø)

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