Fix for `Options.destination` path not replacing extension

[tony]

fix(Options): Fix path to Options.destination to follow Options.format

[codecov[bot]]

Codecov Report

Merging #285 (f632d6d) into master (aef7fb3) will decrease coverage by 0.04%. The diff coverage is 25.00%.

:exclamation: Current head f632d6d differs from pull request most recent head acae600. Consider uploading reports for the commit acae600 to get more accurate results

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   69.45%   69.41%   -0.04%     
==========================================
  Files          10       10              
  Lines        1005     1007       +2     
  Branches      182      182              
==========================================
+ Hits          698      699       +1     
- Misses        282      283       +1     
  Partials       25       25              

Impacted Files	Coverage Δ
tests/test_unihan.py	96.55% <ø> (ø)
src/unihan_etl/options.py	5.00% <25.00%> (+5.00%)	:arrow_up:

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