fill-opacity not available on <g>

[stact]

Following docs https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/fill-opacity
fill-opacity attribute has no effect on

As a presentation attribute, it can be applied to any element but it has effect only on the following eleven elements: <altGlyph>, <circle>, <ellipse>, <path>, <polygon>, <polyline>, <rect>, <text>, <textPath>, <tref>, and <tspan>

The results (don't be scared ^^):

I will create a PR to avoid this behavior to move fill-opacity to the right element.
Hope this package is still maintained

[stact]

PR #39 created

[stact]

@fangpenlin @gkoberger is the project still maintained?

[gkoberger]

Hey I don't have access to this repo, but happy to merge things into my API if it gets merged here :)