Treat non-ascii URLs in UrlValidator.

lib/validators/url_validator.rb

@@ -5,7 +5,12 @@ class UrlValidator < ActiveModel::EachValidator
         begin
           uri = URI.parse(value)
           uri.is_a?(URI::HTTP) && !uri.host.nil? && uri.host.include?(".")
-        rescue
+        rescue URI::InvalidURIError => e
+          if (e.message =~ /URI must be ascii only/)
+            value = URI.encode(value)
+            retry
+          end
+
           nil
         end