Ensure compatibility with Ruby 2.7

Author: ashmaroli

lib/jekyll-archives/page_drop.rb

@@ -8,14 +8,15 @@ class PageDrop < Jekyll::Drops::Drop
       mutable false
 
       def_delegators :@obj, :posts, :type, :title, :date, :name, :path, :url, :permalink
-      private def_delegators :@obj, :site, :relative_path, :data
+      def_delegators :@obj, :site, :relative_path, :data
 
       def fallback_data
         Jekyll::Utils.deep_merge_hashes(
           data, site.frontmatter_defaults.all(relative_path, type)
         )
       end
-      private :fallback_data
+
+      private :site, :relative_path, :data, :fallback_data
     end
   end
 end