Added Louisiana income tax logic

[mitchellpound]

Added Louisiana state individual income tax logic.

• make format and make documentation has been run. (You may also want to run make test.)

[rickecon]

@mitchellpound. Because PR #55 updates the GitHub Actions for this repo in a way that removes our automatic versioning, you should make the following changes to this PR.

• Merge in the changes from recent PRs to this branch
• Update the version number in setup.py to 0.1.4
• Manually add your changes from changelog_entry.yaml to CHANGELOG.md and changelog.yaml. Then delete changelog_entry.yaml

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% 🎉

Comparison is base (6f5f132) 96.64% compared to head (d9b5e85) 96.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   96.64%   96.68%   +0.04%     
==========================================
  Files        1379     1401      +22     
  Lines       21411    21676     +265     
  Branches      195      195              
==========================================
+ Hits        20692    20957     +265     
  Misses        698      698              
  Partials       21       21              

Flag	Coverage Δ
unittests	96.68% <100.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...ariables/gov/states/tax/income/state_income_tax.py	100.00% <ø> (ø)
...come/state_income_tax_before_refundable_credits.py	100.00% <ø> (ø)
...come/household/household_refundable_tax_credits.py	52.94% <ø> (ø)
...usehold/household_tax_before_refundable_credits.py	50.00% <ø> (ø)
...a/tax/income/agi/la_federal_retirement_benefits.py	100.00% <100.00%> (ø)
.../states/la/tax/income/agi/la_other_subtractions.py	100.00% <100.00%> (ø)
...ncome/agi/la_state_employee_retirement_benefits.py	100.00% <100.00%> (ø)
...income/agi/la_state_teacher_retirement_benefits.py	100.00% <100.00%> (ø)
...gov/states/la/tax/income/agi/la_total_additions.py	100.00% <100.00%> (ø)
.../states/la/tax/income/agi/la_total_subtractions.py	100.00% <100.00%> (ø)
... and 16 more

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[rickecon]

@mitchellpound. Looks great. Thanks for your work on this. Merging.