Upstream Cargo authors (not a substitute for individual copyright notices):
isis lovecruft <isis@patternsinthevoid.net>
Tony Arcieri <bascule@gmail.com>
Michael Rosenberg <michael@mrosenberg.pub>

Retained source/header copyright lines:
// Copyright (c) 2017-2019 isis lovecruft
// Copyright (c) 2018-2019 isis lovecruft
