Minimum Ruby version

[monkbroc]

It's a small thing, but I think you should specify spec.required_ruby_version = '>= 2.1.0' in the gemspec because of verify_uploadable def upload(uploadable). Methods return a symbol only on Ruby >= 2.1.

[jnicklas]

Fixed. Though it depends on refile which already has a Ruby version requirement, so it shouldn't be possible to install on older rubies anyway.