Require at least 7.1 in 2.0 branch

allflame · allflame · commit 524143735646 · 2017-12-01T15:02:43.000+02:00
diff --git a/composer.json b/composer.json
@@ -7,7 +7,7 @@
     }
   },
   "require": {
-    "php": "^5.6 | ^7.1",
+    "php": ">=7.1",
     "symfony/event-dispatcher": "~2 || ~3",
     "symfony/console": "~2 || ~3",
     "symfony/http-kernel": "~2 || ~3",
