Fix flake8 in #182

[codecov-io]

Codecov Report

Merging #183 into master will decrease coverage by 0.25%. The diff coverage is 96.55%.

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
- Coverage   89.49%   89.23%   -0.26%     
==========================================
  Files          24       24              
  Lines        1361     1338      -23     
==========================================
- Hits         1218     1194      -24     
- Misses        143      144       +1

Impacted Files	Coverage Δ
onnx_chainer/graph.py	95.55% <ø> (-0.05%)	:arrow_down:
onnx_chainer/functions/normalization.py	90.47% <100%> (-0.44%)	:arrow_down:
onnx_chainer/export.py	89.32% <100%> (-1.74%)	:arrow_down:
onnx_chainer/context.py	97.22% <100%> (+0.92%)	:arrow_up:
onnx_chainer/functions/connection.py	89.13% <100%> (-0.46%)	:arrow_down:
onnx_chainer/functions/math.py	85.5% <100%> (-0.98%)	:arrow_down:
onnx_chainer/functions/pooling.py	83.13% <100%> (-0.59%)	:arrow_down:
onnx_chainer/functions/array.py	90.33% <86.66%> (+0.29%)	:arrow_up:

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[disktnk]

ChainerCI, test this please

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