Drop parameters argument from converters

[disktnk]

parameters is included in context.

before

def convert_func(..., context, parameters):
    parameters.append(p)

after

def convert_fun(..., context):
    context.parameters.append(p)

[disktnk]

/test

[pfn-ci-bot]

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[codecov-io]

Codecov Report

Merging #212 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
- Coverage   89.88%   89.87%   -0.02%     
==========================================
  Files          24       24              
  Lines        1473     1471       -2     
==========================================
- Hits         1324     1322       -2     
  Misses        149      149

Impacted Files	Coverage Δ
onnx_chainer/functions/noise.py	80% <ø> (ø)	⬆️
onnx_chainer/functions/converter.py	100% <ø> (ø)	⬆️
onnx_chainer/functions/loss.py	84% <ø> (ø)	⬆️
onnx_chainer/functions/array.py	90.16% <100%> (ø)	⬆️
onnx_chainer/functions/normalization.py	86.44% <100%> (ø)	⬆️
onnx_chainer/functions/connection.py	89.13% <100%> (ø)	⬆️
onnx_chainer/graph.py	95.65% <100%> (ø)	⬆️
onnx_chainer/functions/pooling.py	88.73% <100%> (ø)	⬆️
onnx_chainer/functions/activation.py	85.48% <100%> (ø)	⬆️
onnx_chainer/functions/math.py	85.71% <100%> (ø)	⬆️

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[shinh]

Nice!