Allow to read HTTP/2 response header.

The issue is HTTP/2 sends the following headers `HTTP/2 200`, `HTTP/2 401`
and so on. It doesn't have third parameter like HTTP/1.1 has: `HTTP/2 200 OK`

lib/internal/Magento/Framework/HTTP/Client/Curl.php

@@ -438,7 +438,7 @@ protected function parseHeaders($ch, $data)
     {
         if ($this->_headerCount == 0) {
             $line = explode(" ", trim($data), 3);
-            if (count($line) != 3) {
+            if (count($line) < 2) {
                 $this->doError("Invalid response line returned from server: " . $data);
             }
             $this->_responseStatus = (int)$line[1];