update symfony 2.7.20 -> 2.7.21

[chihiro-adachi]

symfony及びその他ライブラリの更新

Symfony 2.7.21 released
http://symfony.com/blog/symfony-2-7-21-released

• symfony/*
  • Updating symfony/* (v2.7.20) to symfony/* (v2.7.21)
• twig/twig
  • Updating twig/twig (v1.27.0) to twig/twig (v1.28.2)
• swiftmailer/swiftmailer
  • Updating swiftmailer/swiftmailer (v5.4.3) to swiftmailer/swiftmailer (v5.4.4)
• others
  • Updating friendsofphp/php-cs-fixer (v1.12.3) to friendsofphp/php-cs-fixer (v1.12.4)
  • Updating sebastian/comparator (1.2.0) to sebastian/comparator (1.2.2)
  • Updating phpspec/prophecy (v1.6.1) to phpspec/prophecy (v1.6.2)
  • Updating phpunit/php-token-stream (1.4.8) to phpunit/php-token-stream (1.4.9)
• 備考
  • fzaninotto/faker v1.6.0は Fix: fix invalid parameter of mb_substr() fzaninotto/Faker#917 の不具合があるので見送り