Apply Responder.error_status to Responder#display_errors method

[fschwahn]

See

responders/lib/action_controller/responder.rb

Lines 270 to 274 in 9bdc60d

	def display_errors
	# TODO: use `error_status` once we switch the default to be `unprocessable_entity`,
	# otherwise we'd be changing this behavior here now.
	controller.render format => resource_errors, :status => :unprocessable_entity
	end

With the deprecation of :unprocessable_entity in favor of :unprocessable_content in rack (see rack/rack#2137) I currently need to overwrite the display_errors-method in my app to work around deprecation warnings.

I think the generated default in responders should be updated to unprocessable_content, and it should be applied everywhere. That's a breaking change, so probably requires a minor or major version bump.

[carlosantoniodasilva]

That wasn't changed back when the error_status was introduced because error_status by default wasn't unprocessable_entity, but I plan to swap those defaults and get that fixed in a new version. Thanks!