Merge pull request #9 from slovensko-digital/bugfix/response-headers

fix for correct url string for atlassian

application/src/Service/AtlassianApiService.php

@@ -75,7 +75,7 @@ public function addIssueAttachments(string $issueId, array $files): ResponseInte
                 'Content-Type' => 'application/json',
                 'Authorization' => 'Basic '.$this->token,
             ],
-            RequestOptions::JSON => $data,
+            RequestOptions::BODY => json_encode($data, JSON_UNESCAPED_SLASHES),
         ]);
     }
 }