Rakefile in dry-monitor-0.3.0 vs Rakefile in dry-monitor-0.3.1

@@ -1,5 +1,7 @@
 #!/usr/bin/env rake
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 
 $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), 'lib'))
 
 require 'rspec/core'