Update packaging and CI

[codingjoe]

• Remove deprecated 'filenames' attribute
• Add --version CLI argument
• Change FILE CLI argument to be optional for version prints

[lgtm-com]

This pull request introduces 1 alert when merging 00ef722 into 39dd830 - view on LGTM.com

new alerts:

• 1 for Module imports itself

[lgtm-com]

This pull request introduces 1 alert when merging fe5c1b8 into 39dd830 - view on LGTM.com

new alerts:

• 1 for Module imports itself

[codecov]

Codecov Report

Base: 95.04% // Head: 100.00% // Increases project coverage by +4.95% 🎉

Coverage data is based on head (2f39253) compared to base (39dd830).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 2f39253 differs from pull request most recent head 2458031. Consider uploading reports for the commit 2458031 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #30      +/-   ##
===========================================
+ Coverage   95.04%   100.00%   +4.95%     
===========================================
  Files           3         4       +1     
  Lines         242       125     -117     
===========================================
- Hits          230       125     -105     
+ Misses         12         0      -12     

Impacted Files	Coverage Δ
relint/__main__.py	100.00% <100.00%> (ø)
relint/config.py	100.00% <100.00%> (ø)
relint/exceptions.py	100.00% <100.00%> (ø)
relint/parse.py	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[lgtm-com]

This pull request introduces 1 alert when merging 2f39253 into 39dd830 - view on LGTM.com

new alerts:

• 1 for Module imports itself

[lgtm-com]

This pull request introduces 1 alert when merging 2458031 into 39dd830 - view on LGTM.com

new alerts:

• 1 for Module imports itself