code: private static Identity parse(final JsonObject json) {
          final Map<String, String> props = new HashMap<>(json.size());
          // @checkstyle MultipleStringLiteralsCheck (1 line)
          props.put(PsGithub.LOGIN, json.getString(PsGithub.LOGIN, "unknown"));
          props.put("avatar", json.getString("avatar_url", "#"));
          return new Identity.Simple(
              String.format("urn:github:%d", json.getInt("id")), props
          );
      }
docs: Make identity from JSON object.
  @param json JSON received from Github
  @return Identity found