MiniZinc Python 0.4.1

Added

• Support for Python 3.9. (MiniZinc Python will aim to support all versions of
  Python that are not deprecated)
• Experimental support for capturing the error output of the MiniZinc process
  in CLIInstance.
• Experimental support for verbose compiler and solver output (using the -v
  flag) in CLIInstance.

Changed

• The MiniZinc Python repository moved from GitLab to GitHub, replacing GitLab
  CI for GitHub Actions for the continuous testing.
• Values of an enumerated type defined in MiniZinc will now appear in solutions
  as a member of a singular anonymous enum.Enum class.

Fixed

• Handle the cancellation of asynchronous solving and correctly dispose of the
  process
• Correct the JSON representation of sets of with IntEnum members. (Lists
  are still not correctly represented).
• check_solution will now correctly handle solution values of an enumerated
  type defined in MiniZinc.