Update readme: package is deprecated

[simonbowly]

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[rluce]

Didn't we want to put gurobipy<11 into the requirements.txt, too?

[simonbowly]

See #14. The dependencies are in setup.py, which already pins to gurobipy 10.0.* (but the version 1.0 releases on PyPI need another look).

[rluce]

Oh I see, it's good to go then.