Add version subcommand

[hugovk]

Make it easier to find the version by adding common options.

Before

❯ blurb --versionError: Unknown subcommand: --versionRun 'blurb help' for help.
❯ blurb -vError: Unknown subcommand: -vRun 'blurb help' for help.
❯ blurb versionError: Unknown subcommand: versionRun 'blurb help' for help.
❯ blurb helpblurb version 1.2.2.dev8Management tool for CPython Misc/NEWS and Misc/NEWS.d entries.Usage: blurb [subcommand] [options...]Available subcommands: add Add a blurb (a Misc/NEWS.d/next entry) to the current CPython repo. export Removes blurb data files, for building release tarballs/installers. help Print help for subcommands. merge Merge all blurbs together into a single Misc/NEWS file. populate Creates and populates the Misc/NEWS.d directory tree. release Move all new blurbs to a single blurb file for the release. test Run unit tests. Only works inside source repo, not when installed.If blurb is run without any arguments, this is equivalent to 'blurb add'.

After

❯ blurb --versionblurb version 1.2.2.dev8
❯ blurb -vblurb version 1.2.2.dev8
❯ blurb versionblurb version 1.2.2.dev8

[ezio-melotti]

Codecov says the print is not covered by tests despite the line you added in the tox.ini. Should a simple test ran through pytest be added too?

[hugovk]

Codecov says the print is not covered by tests despite the line you added in the tox.ini. Should a simple test ran through pytest be added too?

Yes, we only have coverage through pytest. Sure, I can add a simple test case.

[ezio-melotti]

Thanks!