Re: Proposal: merge either into transformers

Roman Cheplyaka writes:

I propose to add the sole module of the 'either' package[1], Control.Monad.Trans.Either, to the transformers package.

+1 [...]

Note that 'either' depends on the 'semigroupoids' and 'semigroup'

btw, the package is named 'semigroup*s*'