fix(#487): Should validate start < end

[MauricioRobayo]

closes #487

[codecov]

Codecov Report

Base: 100.00% // Head: 98.80% // Decreases project coverage by -1.20% ⚠️

Coverage data is based on head (e508e43) compared to base (b81e30f).
Patch coverage: 98.30% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #489      +/-   ##
===========================================
- Coverage   100.00%   98.80%   -1.20%     
===========================================
  Files            3        5       +2     
  Lines           42       84      +42     
  Branches         6       28      +22     
===========================================
+ Hits            42       83      +41     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
src/holidays.ts	100.00% <ø> (ø)
src/index.ts	95.23% <92.85%> (-4.77%)	⬇️
src/helpers.ts	100.00% <100.00%> (ø)
src/utils/holidaysWithinInterval.ts	100.00% <100.00%> (ø)
src/utils/isHoliday.ts	100.00% <100.00%> (ø)

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