update readme.md

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@ -15,7 +15,7 @@ This book is written in English and Chinese, you can pick up the language you ar
- 简体中文: [https://zh.exercise.rs](https://zh.exercise.rs)
## About exercises
- Try your best to make exercise comipile with NO ERRORS!
- The only correct way: make exercise comipile with NO ERRORS!
- difficulty level: easy: 🌟 medium: 🌟🌟 hard: 🌟🌟🌟 hell: 🌟🌟🌟🌟
- Everything is online: reading, editing, testing