Incorrect API response

[Nacoma]

This can be easily replicated in by running the following test and examining the output in the CurlClient:

shippo-php-client/test/ParcelTest.php

Lines 48 to 52 in e4b577a

	$pagesize = 1;
	$list = Shippo_Parcel::all(array(
	'results' => $pagesize,
	'page' => '1'
	));

The expected output format according to the documentation is:

{
  "next": null,
  "previous": null,
  "results": [
    {
      "object_state": ...
    },
  ]
}

When the page size is 1 the json fragment is:

{
  "next": null,
  "previous": null,
  "results": {
    "object_state": ...
  }

This causes the test to fail in PHP7.4 because the resulting object is not Countable.