effectful 0.2.0

Effect<A, E, R> (sync + async), context/layers, pipe — interpreter-style, no bundled executor
Documentation 
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//! Ex 023 — `get_path` follows `ThereHere` / `Skip` paths.
use effectful::{ThereHere, Service, ctx};

#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash, Service)]
struct FirstKey;
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash, Service)]
struct SecondKey;

fn main() {
  let env = ctx!(FirstKey => 1_u8, SecondKey => 2_u16);
  assert_eq!(*env.get_path::<SecondKey, ThereHere>(), 2);
  println!("023_get_path ok");
}