Typo in Data.Either

The Haddocks for the Applicative instance for (Either e) says since 3.0, but AFAICT it should be since 4.3.0.0. -- Russell O'Connor <http://r6.ca/> ``All talk about `theft,''' the general counsel of the American Graphophone Company wrote, ``is the merest claptrap, for there exists no property in ideas musical, literary or artistic, except as defined by statute.''