Update README.md

[peterberkenbosch]

Update README with correct installation option

Summary

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• [ ] I have written a thorough PR description.
• [ ] I have kept my commits small and atomic.
• [ ] I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[codecov[bot]]

Codecov Report

Merging #351 (1d41ded) into main (6620766) will decrease coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #351      +/-   ##
==========================================
- Coverage   97.31%   97.30%   -0.02%     
==========================================
  Files         187      187              
  Lines        4511     4491      -20     
==========================================
- Hits         4390     4370      -20     
  Misses        121      121              

see 2 files with indirect coverage changes

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