- [208](https://github.com/kmyk/online-judge-tools/issues/208) features for HackerRank are removed
- [206](https://github.com/kmyk/online-judge-tools/issues/206) support the new `atcoder.jp` domain
- [202](https://github.com/kmyk/online-judge-tools/issues/202) write document
- [201](https://github.com/kmyk/online-judge-tools/issues/201) add `--json` option to `download` command