[Minotaur] Minotaur release 0.4

[Ashutosh Mahajan]

Dear all

We are happy to announce a new release of Minotaur, a software for
mixed-integer nonlinear optimization. Source code is available on GitHub
(https://github.com/coin-or/minotaur) along with some documentation and
references. Binaries for Linux and Windows are available on the Minotaur
homepage (https://minotaur-solver.github.io/).  Any inputs and help in our
ongoing development are most welcome.

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Release Notes for Minotaur v0.4
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* Several enhancements to mglob, the solver for global optimization of
  quadratic optimization including convexity detection, heuristics, RLT cuts
  and bound tightening

* Bug fixes and improvements in interfacing with AMPL and Pyomo

* Solvers available out-of-the box include
    mqg for Quesada-Grossmann (LO/NLO) on convex MINLO
    mbnb for Nonlinear Branch-and-Bound on convex MINLO
    mglob for branch-and-reduce on nonconvex MIQCQO
    mmultistart heuristic for nonconvex MINLO

  mqg is the recommended solver for convex MINLO and mglob for MIQCQO.

* Upgraded third-party software

* Updated log format

* Updated website

Special thanks to coin-or for hosting us as a project.

Regards
Minotaur team