Merge pull request #2647 from Jean85/patch-1

Fix PHPUnit version constraints

Author: XWB

composer.json

@@ -37,7 +37,7 @@
         "symfony/phpunit-bridge": "^2.7 || ^3.0",
         "symfony/validator": "^2.7 || ^3.0",
         "symfony/yaml": "^2.7 || ^3.0",
-        "phpunit/phpunit": "~4.8.35|~5.4.3"
+        "phpunit/phpunit": "^4.8.35|^5.4.3"
     },
     "conflict": {
         "doctrine/doctrine-bundle": "<1.3",