lib/chunky_png/canvas/masking.rb in chunky_png-1.3.12 vs lib/chunky_png/canvas/masking.rb in chunky_png-1.3.13

@@ -1,4 +1,6 @@
+# frozen-string-literal: true
+
 module ChunkyPNG
   class Canvas
     # The ChunkyPNG::Canvas::Masking module defines methods to perform masking
     # and theming operations on a {ChunkyPNG::Canvas}. The module is included into the Canvas class so all
     # these methods are available on every canvas.