DX-914: Theming fix

[asbjornu]

Ensure that the options hash has its keys symbolized properly

[codecov[bot]]

Codecov Report

Merging #64 (ac3897e) into main (2be1089) will decrease coverage by 0.66%. The diff coverage is 78.26%.

:exclamation: Current head ac3897e differs from pull request most recent head 343fbe0. Consider uploading reports for the commit 343fbe0 to get more accurate results

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   89.74%   89.07%   -0.67%     
==========================================
  Files          10        9       -1     
  Lines         234      238       +4     
==========================================
+ Hits          210      212       +2     
- Misses         24       26       +2     

Impacted Files	Coverage Δ
lib/kramdown-plantuml/logger.rb	82.22% <60.00%> (-2.78%)	:arrow_down:
lib/kramdown-plantuml/converter.rb	93.93% <66.66%> (ø)
lib/kramdown-plantuml/themer.rb	87.80% <81.81%> (+1.69%)	:arrow_up:
lib/kramdown-plantuml/executor.rb	96.42% <100.00%> (ø)
lib/kramdown-plantuml/plantuml_result.rb	100.00% <100.00%> (ø)

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[mergify[bot]]

Thank you @asbjornu for your contribution!