Thank Gurobi in README

[odow]

This now matches the verbiage in CPLEX.jl:

[codecov]

Codecov Report

Merging #430 (e029da9) into master (ea60331) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #430   +/-   ##
=======================================
  Coverage   61.75%   61.75%           
=======================================
  Files           8        8           
  Lines        3300     3300           
=======================================
  Hits         2038     2038           
  Misses       1262     1262           

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