Update react/dns to use v1 or v0

Author: Nenad Stojanovikj

composer.json

@@ -14,7 +14,7 @@
         "php": "^5.5 || ^7.0",
         "php-http/httplug": "^1.0",
         "react/http-client": "~0.5.9",
-        "react/dns": "^0.4.15",
+        "react/dns": "^1.0|^0.4.15",
         "react/socket": "^1.0",
         "react/stream": "^1.0",
         "react/event-loop": "^1.0",