Add git-diff argument to directly staged changes

[codingjoe]

• Add git-diff argument to directly staged changes
• fix typo

[codecov]

Codecov Report

Merging #27 (1dab234) into main (52a765e) will decrease coverage by 0.31%.
The diff coverage is 80.00%.

❗ Current head 1dab234 differs from pull request most recent head 91f06ae. Consider uploading reports for the commit 91f06ae to get more accurate results

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   94.71%   94.39%   -0.32%     
==========================================
  Files           3        3              
  Lines         227      232       +5     
==========================================
+ Hits          215      219       +4     
- Misses         12       13       +1     

Impacted Files	Coverage Δ
relint.py	93.65% <80.00%> (-0.57%)	⬇️

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