version.rb in chunky_png-1.3.13

- old
+ new

@@ -1,5 +1,7 @@
+# frozen-string-literal: true
+
 module ChunkyPNG
   # The current version of ChunkyPNG.
   # Set it and commit the change this before running rake release.
-  VERSION = "1.3.12"
+  VERSION = "1.3.13"
 end