Class to enum

[fsabr]

Reference Issue

To Resolve #951

What does this PR implement/fix? Explain your changes.

This PR converts the TaskTypeEnum class to an enum.Enum object

[PGijsbers]

Thanks a ton! I think it's nearly ready for a merge, but I'd like to suggest two changes (see the comments):

• the tasktypes is not defined in the example, which leads to an error
• could you also please update the parameter names from task_type_id to task_type to better signal we moved away from using integers in the code?

[fsabr]

I made the changes you said. Not sure about what I should do with the OpenMLTask class and its children.

[PGijsbers]

Thanks for your contribution! 🎉
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