docs: def add_attachment(self, issue_key, filename):
          """
          Add attachment to Issue
  
          :param issue_key: str
          :param filename: str, name, if file in current directory or full path to file
          """
          log.warning('Adding attachment...')
          headers = {'X-Atlassian-Token': 'no-check'}
          with open(filename, 'rb') as file:
              files = {'file': file}
              url = 'rest/api/2/issue/{}/attachments'.format(issue_key)
  
              return self.post(url, headers=headers, files=files)