conversejs uploadFile fix

      uploadFile() {
        const xhr = new XMLHttpRequest();

        xhr.onreadystatechange = () => {
          if (xhr.readyState === XMLHttpRequest.DONE) {
            _converse.log("Status: " + xhr.status, converse_chat_Strophe.LogLevel.INFO);

            if (xhr.status === 200 || xhr.status === 201) {
              this.save({
                'upload': _converse.SUCCESS,
                'oob_url': this.get('get'),
                'message': this.get('get')
              });
            } else {
              xhr.onerror();
            }
          }
        };

        xhr.upload.addEventListener("progress", evt => {
          if (evt.lengthComputable) {
            this.set('progress', evt.loaded / evt.total);
          }
        }, false);

        xhr.onerror = () => {
          let message;

          if (xhr.responseText) {
            message = __('Sorry, could not succesfully upload your file. Your server’s response: "%1$s"', xhr.responseText);
          } else {
            message = __('Sorry, could not succesfully upload your file.');
          }

          this.save({
            'type': 'error',
            'upload': _converse.FAILURE,
            'message': message,
            'ephemeral': true
          });
        };

        xhr.open('PUT', this.get('put'), true);
        xhr.setRequestHeader("x-amz-acl",'public-read');//<--
        xhr.setRequestHeader("Content-type", this.file.type);
        xhr.send(this.file);
      }