Log Message:
Update to unordered-containers-0.2.16.0

0.2.16.0
* Increase maximum branching factor from 16 to 32
* Tweak union.goDifferentHash
* Fix debug mode bounds check in cloneM
* Remove some old internal compatibility code

0.2.15.0
* Add security advisory regarding hash collision attacks
* Add support for hashable 1.4
* Drop support for GHC < 8

0.2.14.0
* Add HashMap.mapKeys. Thanks, Marco Perone!
* Add instances for NFData1 and NFData2. Thanks, Isaac Elliott and Oleg
  Grenrus!
* Fix @since-annotation for compose. Thanks, @Mathnerd314!