Update README.md

wengsy150943 · Feb 17, 2023 · 9bc7e4c · 9bc7e4c
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 ## Autograding and certification
 
-Since Jun 2022, we start using [github classroom]([https://github.com/talent-plan/tinysql/classroom.md](https://github.com/talent-plan/tinysql/blob/course/classroom.md)) to accept labs and provide autograding timely. The github classroom invitation is https://classroom.github.com/a/cdlNNrFU. The discussion Wechat/Slack group and the certification after you pass the class is provided in the [tinyKV learning class](https://talentplan.edu.pingcap.com/catalog/info/id:263)
+Since Jun 2022, we start using [github classroom](https://github.com/talent-plan/tinysql/classroom.md](https://github.com/talent-plan/tinysql/blob/course/classroom.md) to accept labs and provide autograding timely. The github classroom invitation is https://classroom.github.com/a/cdlNNrFU. The discussion Wechat/Slack group and the certification after you pass the class is provided in the [tinyKV learning class](https://talentplan.edu.pingcap.com/catalog/info/id:263)
 
 ## Contributing