fix: svg color url not to lower

[joda-divid]

fixes #52

[codecov]

Codecov Report

Merging #53 (a831ca9) into master (7d2d346) will increase coverage by 12.17%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master      #53       +/-   ##
===========================================
+ Coverage   48.19%   60.36%   +12.17%     
===========================================
  Files         108      109        +1     
  Lines        2106     2112        +6     
  Branches      422      422               
===========================================
+ Hits         1015     1275      +260     
+ Misses        963      683      -280     
- Partials      128      154       +26     

Impacted Files	Coverage Δ
...sts__/pdf/test-defs/single-image-svg-color-hex.tsx	100.00% <ø> (ø)
...sts__/pdf/test-defs/single-image-svg-color-url.tsx	100.00% <100.00%> (ø)
...rc/abstract-document-exporters/pdf/render-image.ts	43.33% <100.00%> (+4.44%)	⬆️
...stract-document/src/abstract-document/resources.ts	72.72% <0.00%> (+6.06%)	⬆️
...nt/src/abstract-document-exporters/pdf/paginate.ts	63.71% <0.00%> (+6.19%)	⬆️
...src/abstract-document-exporters/pdf/pre-process.ts	30.50% <0.00%> (+11.86%)	⬆️
...bstract-document-exporters/shared/get_resources.ts	78.57% <0.00%> (+32.14%)	⬆️
...src/abstract-document-exporters/pdf/update-refs.ts	71.73% <0.00%> (+32.60%)	⬆️
...ent/src/abstract-document-exporters/pdf/measure.ts	80.36% <0.00%> (+42.94%)	⬆️
... and 2 more

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[xpopy]

You could check for url( instead of url which would make sure we dont miss burlywood as a color.