update fix base chainer version to be 7.0.0

[corochann]

[corochann]

/test

[pfn-ci-bot]

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[codecov-commenter]

Codecov Report

Merging #423 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #423   +/-   ##
=======================================
  Coverage   83.38%   83.38%           
=======================================
  Files         270      270           
  Lines       13265    13265           
=======================================
  Hits        11061    11061           
  Misses       2204     2204           

[corochann]

/test

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