feat(cli.py): Add ability to glob on directories

[Rizhiy]

Ability to glob on directories

Fixes #162, Fixes #205

After checking the behaviour of black and isort, I see that they don't actually glob on no arguments, so I replicated the behaviour here.

yamlfix . should work now.

Checklist

• Add test cases to all the changes you introduce
• Update the documentation for the changes

[coveralls]

Pull Request Test Coverage Report for Build 4012054258

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 27 of 27 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 99.784%

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Totals
Change from base Build 4007509205:	0.01%
Covered Lines:	462
Relevant Lines:	463

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💛 - Coveralls

[Rizhiy]

Don't merge yet, I realised that there is a way to simplify logic a bit, will implement tomorrow.

[Rizhiy]

@lyz-code Hi, ready for merge now.

[lyz-code]

Perfect! thanks for your contribution