Changelog for data-named-0.6.1

-*-change-log-*- 0.6.1 Jun 2016 * Add stack.yaml * Add README * Add `Applicative` instances where needed (as a result of the `Applicative => Monad` proposal) 0.6.0 Jul 2014 * Add `concatForestLeaves` function (inverse of `groupForestLeaves`)