Applicative instance of ExceptT is wrong

[Nikita Volkov]

I've recently discovered a flaw in the Applicative and Alternative
instances of EitherT. I've posted the following pull request to fix them:

https://github.com/ekmett/either/pull/38

The pull request contains the description of the problem.

ExceptT of "transformers" contains exactly the same flaw. However it's not
hosted on GitHub, so I don't know a better place to report the issue then
here.

Best regards,
Nikita Volkov
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