Update rake (and rake-compiler) to suppress the warning. #1099
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This fixes #1095 .
To suppress the warning:
in the process of
bundle exec rake compile
.First I tried to update
Gemfile
like this.But rubocop printed the error message. So, I modified the file as this PR.
It was succeeded on my forked repository's Travis.
https://travis-ci.org/junaruga/mysql2/builds/631909854