Bump Symfony deps

Author: dunglas

composer.json

@@ -17,10 +17,10 @@
         "doctrine/inflector": "^1.0",
         "psr/cache": "^1.0",
         "psr/container": "^1.0",
-        "symfony/http-foundation": "^3.1 || ^4.0",
-        "symfony/http-kernel": "^2.7 || ^3.0 || ^4.0",
-        "symfony/property-access": "^2.7 || ^3.0 || ^4.0",
-        "symfony/property-info": "^3.3.11 || ^4.0",
+        "symfony/http-foundation": "^3.4 || ^4.0",
+        "symfony/http-kernel": "^3.4 || ^4.0",
+        "symfony/property-access": "^3.4 || ^4.0",
+        "symfony/property-info": "^3.4 || ^4.0",
         "symfony/serializer": "^4.1",
         "willdurand/negotiation": "^2.0.3"
     },