Hackage release 1.0.1.1

v1.0.1.1

Updated build matrix. Added Hackage badge. Bumped version to 1.0.1.1.

Hackage release 1.0.1.0

• Exposed GettableStateVar, SettableStateVar and StateVar constructors to make writing own instances possible.
• Added Functor, Applicative and Monad instances for GettableStateVar.
• Various infrastructure improvements.