Add tiny example?

[vitiral]

I think this lets you do something like

1
  .apply(|i| i + 2)
  .apply(myOwnFunctionWhichConsumesI32)

Such an example in the API docs and README would be helpful :smile: :

Congrats on being the Crate of the Week

[mx00s]

The README points to tests/lib.rs which has a couple useful examples. I don't see any context like that in the docs, though.