"Multi-type messaging" example does not compile

[igalic]

the Multi-type Messaging example on the website does not compile.
Apart from missing use statements:

use std::time::Duration;
use riker::actors::*;

it still is wrong:

# cargo build
   Compiling website-examples v0.1.0 (/home/meena/src/riker-rs/website-examples)
error[E0277]: the trait bound `Counter: std::default::Default` is not satisfied
   --> src/main.rs:71:17
    |
71  |     let props = Props::new::<Counter>();
    |                 ^^^^^^^^^^^^^^^^^^^^^ the trait `std::default::Default` is not implemented for `Counter`
    | 
   ::: /home/meena/.cargo/registry/src/github.com-1ecc6299db9ec823/riker-0.4.1/src/actor/props.rs:182:12
    |
182 |         A: ActorFactory,
    |            ------------ required by this bound in `riker::actor::props::Props::new`
    |
    = note: required because of the requirements on the impl of `riker::actor::props::ActorFactory` for `Counter`

error[E0308]: mismatched types
   --> src/main.rs:72:36
    |
72  |     let actor = sys.actor_of_props(props, "counter").unwrap();
    |                                    ^^^^^ expected `&str`, found struct `std::sync::Arc`
    | 
   ::: /home/meena/.cargo/registry/src/github.com-1ecc6299db9ec823/riker-0.4.1/src/actor/props.rs:180:34
    |
180 |     pub fn new<A>() -> Arc<Mutex<impl ActorProducer<Actor = A>>>
    |                                  ----------------------------- the found opaque type
    |
    = note: expected reference `&str`
                  found struct `std::sync::Arc<std::sync::Mutex<impl riker::actor::props::ActorProducer>>`

error[E0308]: mismatched types
  --> src/main.rs:72:43
   |
72 |     let actor = sys.actor_of_props(props, "counter").unwrap();
   |                                           ^^^^^^^^^ expected struct `std::sync::Arc`, found `&str`
   |
   = note: expected struct `std::sync::Arc<std::sync::Mutex<(dyn riker::actor::props::ActorProducer<Actor = _> + 'static)>>`
           found reference `&'static str`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.
error: could not compile `website-examples`.

To learn more, run the command again with --verbose.