fix typo (bis)

Author: nicolas-grekas

composer.json

@@ -48,8 +48,8 @@
     "conflict": {
         "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
         "symfony/dependency-injection": "<3.4",
-        "symfony/http-kernel": "<4.3.7",
         "symfony/form": "<4.3",
+        "symfony/http-kernel": "<4.3.7",
         "symfony/messenger": "<4.3"
     },
     "suggest": {