## 0.7
* `Addr` get refactored. `Syn` and `Unsync` removed. all addresses are
`Syn` now, only `Addr<Actor>` exsits
* `Arbiter` uses `tokio::runtime::current_thread`
* `Arbiter::arbiter()` renamed to `Arbiter::current()`
* `Arbiter::handle()` get removed use `Arbiter::spawn()` instead or you can send
`Execute` message to the `System`.
* `Arbiter::system_arbiter()` get removed use `System::arbiter()` instead.
* Use `actix::actors::resolver` instead of
`actix::actors::resolver::{Connect, ConnectAddr, Connector, ConnectorError, Resolve};`
* `actix::actors::resolver::Connector` renamed to `actix::actors::resolver::Resolver`
* `actix::actors::resolver::ConnectorError` renamed to `actix::actors::resolver::ResolverError`