Gemfile in dry-monitor-0.3.0 vs Gemfile in dry-monitor-0.3.1

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gemspec
 
 gem 'dry-events', git: 'https://github.com/dry-rb/dry-events.git', branch: 'master'