Allow date ranges as input

[kylekatarnls]

Resolves #221

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (036c228) 98.89% compared to head (dad39be) 100.00%.

❗ Current head dad39be differs from pull request most recent head 0b52892. Consider uploading reports for the commit 0b52892 to get more accurate results

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Additional details and impacted files

@@              Coverage Diff              @@
##                3.x      #225      +/-   ##
=============================================
+ Coverage     98.89%   100.00%   +1.10%     
- Complexity      350       365      +15     
=============================================
  Files            24        25       +1     
  Lines           815       856      +41     
=============================================
+ Hits            806       856      +50     
+ Misses            9         0       -9     

Files	Coverage Δ
src/Exceptions/InvalidDateRange.php	100.00% <100.00%> (ø)
src/OpeningHours.php	100.00% <100.00%> (+1.64%)	⬆️

... and 1 file with indirect coverage changes

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