add missing symfony/polyfill-php55 dependency

xabbuh · xabbuh · commit 3cc4e4d0d437 · 2015-12-28T15:56:15.000+01:00
The `json_last_error_msg()` function used in the `JsonResponse` class
requires PHP 5.5.
diff --git a/src/Symfony/Component/HttpFoundation/composer.json b/src/Symfony/Component/HttpFoundation/composer.json
@@ -17,7 +17,8 @@
     ],
     "require": {
         "php": ">=5.3.9",
-        "symfony/polyfill-php54": "~1.0"
+        "symfony/polyfill-php54": "~1.0",
+        "symfony/polyfill-php55": "~1.0"
     },
     "require-dev": {
         "symfony/expression-language": "~2.4|~3.0.0"
