Version 0.6.0

Features

• Merged #19 that closed #13: the version report displayed early in the
  execution of the ship subcommand now uses tabled in order to present
  it in the form of a table, which looks much better while only requiring
  little code to achieve it. An example of it can be found in the updated
  README.md. Many thanks to @ToBinio.

• Merged #22 that closed #21: the import subcommand now ignores by default
  all locally-installed packages, i.e. the ones installed through cargo
install --path=.... This should help to avoid poluting the destination
  configuration file with packages that cannot be updated anyway since they
  have no guarantee of existing in the registry used. If the previous behavior
  is still desired however, a new --keep-local CLI option has been added for
  this reason. As a side-effect, --keep-self's shorthand -k has been
  changed to -s in order to make room for the new option's -l. Many thanks
  to @ToBinio.

• The error reporting has been completely overhauled in order to add context
  through the call stacks. Thanks to color-eyre, the errors now transport
  additional information indicating what exactly failed, why it could have
  happened so and how it could be fixed. This should help users diagnose and
  fix the usual issues quicker, such as missing files. It should also combine
  well with the CLI verbosity controls in case more precise debugging is still
  required as they now also control the verbosity of these error reports: when
  -v is given, the RUST_BACKTRACE=1 format is used and when -vv or more
  is given, RUST_BACKTRACE=full is used; when -qqq or more is given, the
  error report is entirely skipped. It is also not displayed in the logs
  anymore, since the whole point is to have a proper termination type.

Fixes

• Merged #20: the build was broken for Windows because of some Unix-specific
  API that slipped in; it is now fixed. GNU/Linux is still the only platform
  tested in CI, but the others should work fine. Thanks to @ToBinio.

• Made sure the exit status code of the cargo search child processes spawned
  in order to fetch the latest versions of the configured packages was checked
  before continuing. Previously, only errors specifically related to spawning
  and waiting for them were checked and bubbled up, but no manual check was
  actually done on the status code. The reported error should now be clearer.

Testing

The fixtures have been updated and new tests have been added for:

• The change of the version report.
• The new import filtering feature and its --keep-local option.
• The new error reporting.

Documentation

• CONTRIBUTING.md:
  • Added a mention for GPG signing as a requirement.
  • Added precisions about the development environment used.
  • Added a mention for the new error contexts.
• README.md:
  • Updated the CLI help usage messages for the new features: the new import
    option and the changed error reporting.
  • Fixed the link to Cargo's install documentation.
  • Wrapped the example output lines to 69 columns at most. It was previously
    done at 70, but was apparently still too much by one for crates.io.
    Hopefully, it is now correct.
  • Updated the crates.io download stats badge's link to point at the bottom
    of the page in order to provide quicker access. Hopefully, it will work.
• CHANGELOG.md:
  • Fixed a random typo lost somewhere.
  • Made a hidden version notes template for quicker releases.
  • Added a new version.

Miscellaneous

• The dependencies have been updated, which required updating some testing
  code to adapt to the changes included in Snapbox.
• Introduced a stricter Rustfmt configuration for more control over the
  automatic formatting and to enforce things done manually.
• Introduced a Justfile in order to provide some command shortcuts useful
  during development.
• The MSRV has been bumped to 1.76 in order to use Result::inspect_err.