rm old yarn binary

bin/yarn

@@ -1,11 +0,0 @@
-#!/usr/bin/env ruby
-APP_ROOT = File.expand_path('..', __dir__)
-Dir.chdir(APP_ROOT) do
-  begin
-    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
-end