Features from optional dependencies

async-std implicit feature

Enables async-std

async-std:

Async version of the Rust standard library

Affects socket::DefaultSocketFactory, socket::AsyncStdSocketFactory, browse::browse, browse_host::browse_host, browse_instance::browse_instance, browse_instance_dac::browse_instance_dac

tokio implicit feature

Enables tokio ^0.2

tokio:

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

Affects socket::DefaultSocketFactory, socket::TokioSocketFactory, browse::browse, browse_host::browse_host, browse_instance::browse_instance, browse_instance_dac::browse_instance_dac