Typo dans composer.json.

composer.json

@@ -16,7 +16,7 @@
     },
     "minimum-stability": "stable",
     "require": {
-        "php": "^7.1"
+        "php": "^7.1",
         "ext-json": "*",
         "ext-zip": "*",
         "api-platform/core": "^2.2",