Update README.md

[Alugor]

The flag's name changed

Pull Request Etiquette

• [x] I have checked the PRs for upcoming features/bug fixes.
• [x] I have read the contributing guidelines.

Changes

• [ ] Internal code
• [ ] Library interface (affecting end-user code)
• [x] Documentation
• [ ] Other: _____

Closes Issue: NaN

Description

Replace this sentence with general description of what your Pull Request does.

[freya022]

This line was already removed in a README rewrite

[MinnDevelopment]

This is no longer needed