Refactor project dependencies

[chomechome]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #2      +/-   ##
==========================================
- Coverage   91.44%   91.43%   -0.02%     
==========================================
  Files          75       75              
  Lines         783      782       -1     
==========================================
- Hits          716      715       -1     
  Misses         67       67              

Impacted Files	Coverage Δ
maru/resource/crf/__init__.py	100.00% <100.00%> (ø)
maru/resource/linear/__init__.py	100.00% <100.00%> (ø)
maru/resource/rnn/__init__.py	100.00% <100.00%> (ø)
maru/tagger/rnn.py	100.00% <100.00%> (ø)

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