Update to rails 5.2.2.1

bin/yarn

@@ -0,0 +1,9 @@
+#!/usr/bin/env ruby
+APP_ROOT = File.expand_path('..', __dir__)
+Dir.chdir(APP_ROOT) do
+  exec 'yarnpkg', *ARGV
+rescue Errno::ENOENT
+  $stderr.puts 'Yarn executable was not detected in the system.'
+  $stderr.puts 'Download Yarn at https://yarnpkg.com/en/docs/install'
+  exit 1
+end