Use the recommended OR operator

Author: javiereguiluz

composer.json

@@ -31,7 +31,7 @@
         "white-october/pagerfanta-bundle"      : "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit"                      : "^4.8 | ^5.0",
+        "phpunit/phpunit"                      : "^4.8 || ^5.0",
         "sensio/generator-bundle"              : "^3.0",
         "symfony/phpunit-bridge"               : "^3.0"
     },