code: public List<GitlabBadge> getGroupBadges(Integer groupId) throws IOException {
          String tailUrl = GitlabGroup.URL + "/" + groupId + GitlabBadge.URL;
          return Arrays.asList(retrieve().to(tailUrl, GitlabBadge[].class));
      }
docs: Get project badges
  
  @param groupId The id of the group for which the badges should be retrieved
  @return The list of badges
  
  @throws IOException on GitLab API call error