bundle installでMake sure that `gem install mysql2 -v '0.3.21'でる - gem

なんやねん。

An error occurred while installing mysql2 (0.3.21), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.21' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
mysql2

結論。これでいけた

gem 'mysql2', '~> 0.4.10'

参考

https://github.com/brianmario/mysql2/issues/981

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