Sync output (#42)

* Sync output

* Rubocop

lib/client.rb

@@ -132,6 +132,6 @@ def certificate=(new_cert)
       File.delete filename if File.exist? filename
       return
     end
-    File.open(filename, 'w') { |file| file.write(new_cert) }
+    File.write(filename, new_cert)
   end
 end

omejdn.rb

@@ -1,5 +1,9 @@
 # frozen_string_literal: true
 
+# Enforce logging output
+$stdout.sync = true
+$stderr.sync = true
+
 require 'rubygems'
 require 'bundler/setup'
 require 'rack'