Changelog for digestive-functors-0.7.1.3

- 0.7.1.2 * Bump `text` dependency to allow up to `text-1.3` - 0.7.1.1 * Bump `QuickCheck` dependency to allow `QuickCheck-2.7` * Clean warnings in tests compilation * Don't use `Text.Read` to fix compilation on GHC 7.4 - 0.7.1.0 * Add `validateOptional` function * Add `condition` functions to allow composing multiple independent validation functions * Bump `text` dependency to allow `text-1.1`