data_source.rb in nanoc-4.7.10

- old
+ new

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 module Nanoc
   # Responsible for loading site data. It is the (abstract) superclass for all
   # data sources. Subclasses must at least implement the data reading methods
   # ({#items} and {#layouts}).
   #