0.5.2
-----
* Added Process
* Added `runSequential`, `sequential` for operational monad

0.5.1
-----
* Added PushPull functor
* Removed `sequential`

0.5
-----
* Lift has gone
* Use elevator instead of Lift
* Moved Request to a separate module

0.4
-----
* Added Request functor along with Lift
* Supported "extensible" objects using open unions
* AccessT is now obsolete