allow the var dumper host to be env based

Author: taitai42

config/config.php

@@ -4,5 +4,5 @@
     /*
      * The host to use when listening for debug server connections.
      */
-    'host' => 'tcp://127.0.0.1:9912',
+    'host' => env('DUMP_SERVER_HOST', 'tcp://127.0.0.1:9912'),
 ];