fix for php 7.1 and delete deprecated symfony/lts

composer.json

@@ -12,7 +12,6 @@
         "symfony/console": "^4.1",
         "symfony/flex": "^1.0",
         "symfony/framework-bundle": "^4.1",
-        "symfony/lts": "^4@dev",
         "symfony/monolog-bundle": "^3.3",
         "symfony/orm-pack": "^1.0",
         "symfony/serializer-pack": "^1.0",
@@ -74,7 +73,8 @@
     },
     "extra": {
         "symfony": {
-            "allow-contrib": false
+            "allow-contrib": false,
+            "require": "~4.1.0"
         }
     }
 }