Also update the connection interface

The connection interface also needs the new port member variable and get function

Author: afrozenpeach

src/Elasticsearch/Connections/ConnectionInterface.php

@@ -50,6 +50,13 @@ public function getTransportSchema();
      */
     public function getHost();
 
+    /**
+     * Get the port for this connection
+     *
+     * @return int
+     */
+    public function getPort();
+
     /**
      * Get the username:password string for this connection, null if not set
      *