pueue 1.0.1 on Rust Cargo

[1.0.1] - 20-08-2021

Update to clap v3.0.0-beta.4. The upgrade from beta.2 to beta.4 introduced breaking changes, which lead to compiler errors when doing a cargo install without --locked.
A beta upgrade seems to be handled like a patch version in semantic versioning.
This isn't a bug per se, but it leads to confusion when people forget the --locked flag during install.