add symfony versions other that 2.8

composer.json

@@ -14,12 +14,12 @@
         "ext-curl": "*",
         "guzzle/guzzle": "~3.7",
         "jms/serializer": "~0.12 || ~1.4.2",
-        "symfony/validator": "2.8.*",
+        "symfony/validator": "~2.8|~3.4|~4.0",
         "doctrine/cache": "~1.6",
         "psr/log": "~1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "7.1."
+        "phpunit/phpunit": "~7"
     },
     "support": {
         "email": "support@retailcrm.ru"