smfx

Results 3 issues of smfx

Hi! 1. I start echo server with: `cargo r -p echo_server` 2. Then I start the native example: `cargo run -p example_app` 3. I see the connection both on client:...

I can't deserialise order update with the new type AMENDMENT. I changed [enum](https://github.com/Igosuki/binance-rs-async/blob/c3ab0e9d0bdb141b56108caadc7167531894873a/src/rest_model.rs#L1226) and now it works. Going to open PR.

Fixes https://github.com/Igosuki/binance-rs-async/issues/142