v0.5.2

Ortools migration release on PyPi

• Changing the licence from MIT to Apache 2.0.
• Migrating the code base from Minizinc to Ortools as a default solver.
• Module structure (i.e. directories) major changes.

v0.5.1

First release on PyPi

• We have changed the name of cppy to cpmpy
• Modifying internal pipelines