Merge pull request #1 from cloudvolumes/fix-single-arity-template-handlers-deprecation-warning-in-rails-6

Fix single arity template handler deprecation warning for Rails 6

Author: sukeerthiadiga

lib/jsonify-rails/jsonify_builder.rb

@@ -26,9 +26,10 @@ def default_format
           Mime::JSON
         end
 
-        def self.call(template)
+        def self.call(template, source = nil)
+          source ||= template.source
           "json = ::Jsonify::Builder.new(:format => :#{jsonify_format});" +
-            template.source +
+            source +
           ";\njson.compile!;"
         end