- update to 0.11.2.0
* Enable PolyKinds to generalize Proxy, Tagged, and Const instances.
* Add unsafeToEncoding in Data.Aeson.Types, use with care!

- update to 0.11.1.4
* Fix build with base < 4.8 and unordered-containers < 0.2.6.
* Add missing field in docs for defaultOptions.
* Fixes a bug where the hashes of equal values could differ.
* The only changes are added instances. (0.11.1.0)
+ These are new:
ToJSON a => ToJSON (NonEmpty a)
FromJSON a => FromJSON (NonEmpty a)
ToJSON (Proxy a)
FromJSON (Proxy a)
ToJSON b => ToJSON (Tagged a b)
FromJSON b => FromJSON (Tagged a b)
ToJSON a => ToJSON (Const a b)
FromJSON a => FromJSON (Const a b)
+ These are now available for older GHCs:
ToJSON Natural
FromJSON Natural
* This release should be close to backwards compatible with aeson 0.9 (0.11.0.0)
+ Breaking changes:
Revert .:? to behave like it did in 0.9. If you want the 0.10 behavior
use .:! instead.
Revert JSON format of Either to 0.9, Left and Right are now serialized with
an initial uppercase letter. If you want the names in lowercase you can
add a newtype with an instance.
All ToJSON and FromJSON instances except for [a] are no longer OVERLAPPABLE.
Mark your instance as OVERLAPPING if it overlaps any of the other aeson