Fractals benchmark

I spent some time today porting react-fractals to choo. You can see the result at http://choo-fractals.surge.sh, source at ricardobeat/choo-fractals.

Preact version used as base: https://preact-factals.surge.sh/

A comparison of several rendering engines: https://swizec.com/blog/animating-svg-nodes-react-preact-inferno-vue/swizec/7311

Performance is okayish - it gets really sluggish after 7-8 levels. I guess this is more of a benchmark on bel/nanomorph, and it's also my first time using this lib, so it looks a bit rough - suggestions for optimizations are very welcome.