Specify Ruby in Gemfile
Specify Ruby in Gemfile

This tells Heroku which version of Ruby to use[1].

Although this change introduces some duplication between .ruby-version and
Gemfile, @floehopper pointed out that it shouldn't be too much of a problem. If
the two versions fall out of sync then Bundler will fail fast.

[1]: https://devcenter.heroku.com/articles/ruby-versions#selecting-a-version-of-ruby

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