RUSTSEC-2020-0016: `net2` crate has been deprecated; use `socket2` instead

[github-actions[bot]]

net2 crate has been deprecated; use socket2 instead

Details
Status	unmaintained
Package	net2
Version	0.2.37
URL	https://github.com/deprecrated/net2-rs/commit/3350e3819adf151709047e93f25583a5df681091
Date	2020-05-01

The net2 crate has been deprecated and users are encouraged to considered socket2 instead.

See advisory page for additional details.

[mortendahl]

Blocked by a new release of https://crates.io/crates/notify