fix rubocop

lib/tasks/annotate_rb.rake

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 # This rake task was added by annotate_rb gem.
 
 # Can set `ANNOTATERB_SKIP_ON_DB_TASKS` to be anything to skip this
-if Rails.env.development? && ENV["ANNOTATERB_SKIP_ON_DB_TASKS"].nil?
+if Rails.env.development? && ENV['ANNOTATERB_SKIP_ON_DB_TASKS'].nil?
-  require "annotate_rb"
+  require 'annotate_rb'
 
   AnnotateRb::Core.load_rake_tasks
 end