Update dependencies to support Symfony 5 (#161)

Author: rgzp

composer.json

@@ -44,8 +44,8 @@
     "ext-json": "*",
     "ext-pcre": "*",
     "justinrainbow/json-schema": "^5.0",
-    "symfony/yaml": "^3.0|^4.0",
-    "symfony/routing": "^3.0|^4.0",
+    "symfony/yaml": "^3.0|^4.0|^5.0",
+    "symfony/routing": "^3.0|^4.0|^5.0",
     "oodle/inflect": "^0.2",
     "psr/http-message": "^1.0",
     "willdurand/negotiation": "^2.2.1"