Features from optional dependencies

bincode implicit feature
serde implicit feature

Enables serde

serde:

A generic serialization/deserialization framework

serde_json implicit feature

Enables serde_json

serde_json:

A JSON serialization file format

tokio implicit feature

Enables tokio

tokio:

An event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications

tokio-util implicit feature

Enables tokio-util ^0.6

tokio-util:

Additional utilities for working with Tokio