Clarify ORTools_jll requires Linux

[odow]

Closes #96

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.39%. Comparing base (916fe92) to head (2c56a1e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   98.39%   98.39%           
=======================================
  Files           3        3           
  Lines         499      499           
=======================================
  Hits          491      491           
  Misses          8        8           

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