tasks.rb in rake_docker-2.18.0.pre.4

- old
+ new

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 require_relative 'tasks/clean'
 require_relative 'tasks/prepare'
 require_relative 'tasks/build'
 require_relative 'tasks/tag'
 require_relative 'tasks/push'