v2.1.2

• Set minimum OS version to Catalina (10.15) because swift screensaver support is dodgy in prior versions.
• Draw obscured edges lightly. This makes the objects look more 3-dimensional. The back edges were present in v1.0. Then hidden fully in v2.0.0. I've decided to bring them partially back.
• Use hsluv color space to generate perceptually luminous colors. The prior versions used an HSV spline to generate the colors. However, changing the hue degrees generates colors with differing luminosities. i.e. blue was "dark" and yellow/green was "light". This improvement makes them similar in subjective "lightness" to avoid the blues from making the object disappearing.
• Don't forget to star this project so this can get on homebrew's main cask distribution.