https://chartkick.com
https://github.com/ankane/chartkick.js/issues/117
https://github.com/ankane/chartkick/blob/master/CHANGELOG.md
https://github.com/ankane/chartkick/commit/b810936bbf687bc74c5b6dba72d2397a399885fa
https://github.com/ankane/chartkick/commits/master
https://rubygems.org/gems/chartkick/
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