URL in description and README broken

The URL in the repository description and README are pointing to githubschool's copy of the game instead of yours.

Please fix both so they point to your copy of the game at https://githubschool.github.io/github-games-rsinha2020/

打开仓库的 README，并检查仓库描述设置。将指向 GitHub School 上游副本的两个链接替换为 https://githubschool.github.io/github-games-rsinha2020/。当仓库描述和 README 都指向指定的游戏 URL 时，即表示完成。

由索引模型根据 Issue 内容生成。