Remove the duoshuo option in readme

[pi-dal]

Related issues:

Changes

Removed the duoshuo option in readme ### Testing guide ### Checklist - [ ] I checked the code style with `npm run lint` - [x] I updated the README or the documentation

• [ ] I tested my changes with the current recommended Node LTS version:
• [ ] I tested my changes on all desktop browsers listed below (with their latest versions):
  • [ ] Chrome, Firefox and Opera
  • [ ] Safari
  • [ ] Edge
  • [ ] IE 10+
• [ ] I tested my changes on all mobile browsers listed below (with their latest versions):
  • [ ] Chrome, Firefox and Opera
  • [ ] Safari
  • [ ] Edge

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This change is 

[LouisBarranqueiro]

👋 @pi-dal, yeah, I forgot to remove it 😄 Thanks for the help! 🙂