MiniZinc Python 0.2.3

Changed

• Add text to the empty MiniZincError that occurs when MiniZinc exits with a non-zero
  exit status

Fixed

• Close generated solver configuration before handing it to MiniZinc. This fixes the
  usage of generated solver configurations on Windows.
• The DZN parser now constructs correct range objects. The parser was off by one due to
  the exclusive upper bound in Python range objects.
• Rewrite MiniZinc fields that are keywords in Python. These names cannot be used
  directly as members of a dataclass. Python keywords used in MiniZinc are rewritten to
  "mzn_" + {keyword} and a warning is thrown.