Support for vector-0.12

[mayeranalytics]

bitstream requires vector-0.10, which is somewhat outdated.
Unfortunately the vector library underwent some changes, in particular with regards to Stream. From what I can tell, the constructor was

forall s . Stream (s -> m (Step s a)) s Size

and is now

forall s . Stream (s -> m (Step s a)) s

Also, the size hints moved from Data.Vector.Fusion.Stream.Size to Data.Vector.Fusion.Bundle.Size.

I'm not quite sure what's going on here, the changes seemed to have happened when going from 0.11 to 0.12, and the changelog describes this as the

New generalized stream fusion framework.

Maybe this 2013 paper has something to do with it.

In any case, it seems to me that it is worth supporting vector-0.12.

[depressed-pho]

Fixed in 0.3.0.0