Update index.rst requirements

[suspiciousRaccoon]

I simply copy pasted the ones from the README.rst

Description of the Change

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d4a4d4d) 97.56% compared to head (0d52436) 97.56%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1375   +/-   ##
=======================================
  Coverage   97.56%   97.56%           
=======================================
  Files          32       32           
  Lines        2132     2132           
=======================================
  Hits         2080     2080           
  Misses         52       52           

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[n2ygk]

Thanks for this. It would be DRYer if we were able to have one file listing these requirements and include it in the markdown, RST, and setup.cfg but that appears to be not something that can easily be done.