Changelog for bitset-1.1

-*- mode: outline -*- * 1.1 Added conversion to and from the underlying Integral value (thanks to Mathieu Boespflug). * 1.0 Instead of a custom Hash typeclass, we now use Enum. It's standard and it gives us exactly what we need, so it's a win-win. Also, use unboxed tuples to represent the bitset.