blogging.rb in nanoc-4.8.6

- old
+ new

@@ -50,10 +50,10 @@
         validate_feed_item
         validate_articles
       end
 
       def build
-        buffer = String.new
+        buffer = +''
         xml = Builder::XmlMarkup.new(target: buffer, indent: 2)
         build_for_feed(xml)
         buffer
       end
 