Support fill rule

[ramirezcgn]

Fixes #62

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• I made some tests for my changes
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  contributors
  field of the package.json file

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My NPM username: ramirezcgn

[jebos]

Good work! I can confirm that those changes are fixing the issue for me. 100% success.

[nfroidure]

Looking at the code, it looks like the paper dependency is making the script slower since it brokes the tests timeouts. I'd like to have advice from the users community whether it worth the merge knowing that one can transforms its SVG files with Inkscape to avoid having fill-rule in them. LMKWYT.

[coveralls]

Coverage increased (+1.0%) to 58.833% when pulling f131f70 on ramirezcgn:support-fill-rule into 7bafaf3 on nfroidure:master.