Allow Symfony 5.0

Author: nicolas-grekas

composer.json

@@ -22,12 +22,12 @@
         "symfony/service-contracts": "^1.1"
     },
     "require-dev": {
-        "symfony/config": "~3.4|~4.0",
-        "symfony/event-dispatcher": "^4.3",
-        "symfony/dependency-injection": "~3.4|~4.0",
-        "symfony/lock": "~3.4|~4.0",
-        "symfony/process": "~3.4|~4.0",
-        "symfony/var-dumper": "^4.3",
+        "symfony/config": "^3.4|^4.0|^5.0",
+        "symfony/event-dispatcher": "^4.3|^5.0",
+        "symfony/dependency-injection": "^3.4|^4.0|^5.0",
+        "symfony/lock": "^3.4|^4.0|^5.0",
+        "symfony/process": "^3.4|^4.0|^5.0",
+        "symfony/var-dumper": "^4.3|^5.0",
         "psr/log": "~1.0"
     },
     "provide": {