Fix Field.fail deprecation warning

[lucasmbrown]

This PR fixes the Field.fail deprecation warning that can clog up the logs. See issue #32.

I'm new around here so apologies if there are developer conventions I've missed. This passes all unit tests and tox tests.

[lucasmbrown]

@justanr @svidela - Are one of you game to merge this and cut a release? Thanks! I'd help but I'm not a contributor.

[svidela]

Hey @lucasmbrown! I'm not a maintainer actually. I simply made a small contribution once.

[lucasmbrown]

@justanr -- are you able to merge and cut a release?

[timc13]

👍 what's the maintenance story on this repo? ....

[sloria]

Could you just rename fail to make_error and set fail = make_error?

    def make_error(self, key, **kwargs):
        # ...

    fail = make_error  # marshmallow 2 compatibility

fail should only get called in marshmallow 2 anyway.

[toddkblake]

@lucasmbrown @sloria @justanr can we get a solution here?

[sloria]

I don't have time to look into this myself (I'm not currently using this project--just happened upon this issue), but I believe my code snippet above should suffice to fix this.

[justanr]

Should be fixed from merging #44 into next-release. Closing this on that assumption, but reopen if needed.

[ScottABrown]

Seems still present in marshmallow-enum==1.5.1. Is this in any released version yet?

$ grep -n fail ~/.virtualenvs/myproject/lib/python3.9/site-packages/marshmallow_enum/__init__.py | grep super
117: super(EnumField, self).fail(key, **kwargs)