[minor] composer.json fix

Author: nicolas-grekas

src/Symfony/Component/Templating/composer.json

@@ -19,7 +19,7 @@
         "php": ">=5.3.3"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "~2.7"
+        "symfony/phpunit-bridge": "~2.7",
         "psr/log": "~1.0"
     },
     "suggest": {