[README] update annotations with correct types

[odow]

Closes #408

My guess is that our friend Clong is Int64 on nix and Int32 on Windows. CPLEX really wants Clonglong here, which is the CPXLONG constant.

[codecov]

Codecov Report

Base: 43.46% // Head: 43.46% // No change to project coverage 👍

Coverage data is based on head (724de2b) compared to base (6e7be8e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #409   +/-   ##
=======================================
  Coverage   43.46%   43.46%           
=======================================
  Files           8        8           
  Lines        5025     5025           
=======================================
  Hits         2184     2184           
  Misses       2841     2841           

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