Gemfile in avrolution-0.6.1 vs Gemfile in avrolution-0.7.0

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 # override the :github shortcut to be secure by using HTTPS
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}.git" }