Check libyaml version used by Psych gem

heroku_apps_libyaml_versions.rb

#!/usr/bin/env rvm-auto-ruby
 
heroku_apps = `heroku apps`
heroku_apps = heroku_apps.split("\n")
heroku_apps.shift
heroku_apps.map! {|item| item.split(" ")[0] }
 
heroku_apps.each do |app|
	puts "#{app}: "
	output =  `heroku run "ruby -rpsych -e 'p Psych.libyaml_version.join(\\".\\")'" -a #{app}`
	puts output[/(\d.\d.\d)/, 1]
	puts '------------------------------------'
end