Extra instances for Quiver.

Various extra instances for Quiver that aren't yet in the main library.

Currently this provides instances for the MonadThrow, MonadCatch and MonadMask classes from the exceptions library.

quiver-instances

Various extra instances for Quiver that aren't yet in the main library.

At this time these consist of instances for the typeclasses found in the exceptions, transformers-base and resourcet libraries.