Rails 5.0.0.beta4 will log this deprecation warning.
DEPRECATION WARNING: Accessing mime types via constants is deprecated. Please change Mime::HTML to Mime[:html]. (called from render_with_remotipart at ~/gems/remotipart-3a6acb36d46d/lib/remotipart/render_overrides.rb:18)
Rails 5.0.0.beta4 will log this deprecation warning.
This pull request fixes the warning.