Gemfile in paubox-0.2.3 vs Gemfile in paubox-0.3.0

@@ -1,4 +1,6 @@
-source 'https://rubygems.org'
-
-# Specify your gem's dependencies in paubox_ruby.gemspec
-gemspec
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in paubox_ruby.gemspec
+gemspec