Improve linting

[yangarbiter]

[codecov-commenter]

Codecov Report

Patch coverage: 79.85% and project coverage change: +0.22 :tada:

Comparison is base (1079085) 89.60% compared to head (af55b16) 89.82%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
+ Coverage   89.60%   89.82%   +0.22%     
==========================================
  Files          37       37              
  Lines        1597     1563      -34     
==========================================
- Hits         1431     1404      -27     
+ Misses        166      159       -7     

Impacted Files	Coverage Δ
libact/base/interfaces.py	95.83% <ø> (+17.26%)	:arrow_up:
libact/labelers/__init__.py	60.00% <0.00%> (ø)
libact/labelers/interactive_labeler.py	36.84% <0.00%> (-5.27%)	:arrow_down:
libact/query_strategies/__init__.py	76.92% <ø> (ø)
...trategies/density_weighted_uncertainty_sampling.py	98.70% <ø> (-0.02%)	:arrow_down:
libact/models/svm.py	96.00% <75.00%> (ø)
libact/query_strategies/multiclass/mdsp.py	78.57% <78.57%> (-0.19%)	:arrow_down:
libact/labelers/ideal_labeler.py	100.00% <100.00%> (ø)
libact/models/logistic_regression.py	95.00% <100.00%> (+0.26%)	:arrow_up:
libact/models/perceptron.py	100.00% <100.00%> (ø)
... and 5 more

... and 10 files with indirect coverage changes

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