No longer required to use Syn in README.md example.
@@ -58,7 +58,7 @@ the [`Actor`](https://actix.github.io/actix/actix/trait.Actor.html) trait.
```rust
extern crate actix;
-use actix::{msgs, Actor, Addr, Arbiter, Context, Syn, System};
+use actix::{msgs, Actor, Addr, Arbiter, Context, System};
struct MyActor;
