Cargo.toml declares needlessly tight dependencies

[jonassmedegaard]

Semver versioning scheme used by Cargo defines ~ to mean same minor version, and ^ to mean same major version.
Cargo also implicitly treat 0.x releases as restricted to same minor version, and an otherwise plain plain version number as restricted to same major version.

This project explicitly prefixes several dependency strings with ~. This is unneeded, and for stable crates clap and termion even worse as it needlessly hinders reverse dependencies in using newer minor versions of those.

Please drop all ~ prefixes in Cargo.toml as this project and all its dependencies follow semver versioning where such annotation is unneeded.

For a concrete patch, see this patch part of my packaging of this project for Debian.