Introduce replace_leading_whitespace() for #170

[mstackhouse]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (5e5d244) 92.52% compared to head (4a94429) 92.24%.
Report is 16 commits behind head on devel.

❗ Current head 4a94429 differs from pull request most recent head 8314175. Consider uploading reports for the commit 8314175 to get more accurate results

Files	Patch %	Lines
R/replace_leading_whitespace.R	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #171      +/-   ##
==========================================
- Coverage   92.52%   92.24%   -0.29%     
==========================================
  Files          43       45       +2     
  Lines        2784     2799      +15     
==========================================
+ Hits         2576     2582       +6     
- Misses        208      217       +9     

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[asbates]

This will definitely be helpful. Great idea!