sidekiq4.gemfile in sidekiq-logstash-1.2.0

- old
+ new

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gem 'sidekiq', '~> 4.0'
 
-gemspec path: '../'
\ No newline at end of file
+gemspec path: '../'