Merge pull request #169 from bold-commerce/SHOP-2538

SHOP-2538 shopify's location header needs to be lower case

src/Services/Client.php

@@ -294,7 +294,7 @@ private function sendRequestToShopify(Request $request, array $cookies = [], $pa
     private function getRedirectResponseFromShopify(Request $request)
     {
         $result = null;
-        $locationIndex = 'Location';
+        $locationIndex = 'location';
 
         $options = [
             'allow_redirects' => false,