fix: handle camel-case options correctly

[larsjkr]

Resolves #196

The Problem was that Intl.DateTimeFormat expects e.g. timeZone, but the current implementation passes e.g. timezone instead.

// currently
new Intl.DateTimeFormat(options.locale, { timezone: 'America/New_York' });

// after fix
new Intl.DateTimeFormat(options.locale, { timeZone: 'America/New_York' });

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (da15ccd) 100.00% compared to head (d9f6be8) 99.10%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #197      +/-   ##
===========================================
- Coverage   100.00%   99.10%   -0.90%     
===========================================
  Files            3        3              
  Lines          105      112       +7     
  Branches         9       11       +2     
===========================================
+ Hits           105      111       +6     
- Misses           0        1       +1     

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[danielroe]

My apologies for the long delay on reviewing this, and thank you for the fix ❤️