try (Response response = client.newCall(request).execute()) {
      // Deserialize HTTP response to concrete type.
      ResponseBody body = response.body();
      List<Contributor> contributors = CONTRIBUTORS_JSON_ADAPTER.fromJson(body.source());

      // Sort list by the most contributions.
      Collections.sort(contributors, (c1, c2) -> c2.contributions - c1.contributions);

      // Output list of contributors.

        File file = new File(path);
        if (!file.exists()) {
            return Collections.emptyList();
        }
        try {
            return new Gson().fromJson(new FileReader(file), new TypeToken<List<UpgradedProperty>>() {}.getType());
        } catch (FileNotFoundException e) {
            throw new UncheckedIOException(e);
        }
    }

    /**