cycle v0.3.0 released

I just released v0.3.0 of cycle.

This version uses Chroma for syntax highlighting instead of Pygments. I never got Pygments running correctly in Netlify's build environment. Chroma requires no dependencies since it's distributed as a static binary and it's also faster due to being written in golang.

This version also refactors the main function to accept an optional working directory arg. This allows me to build a site via the CL REPL. It also shortens the feedback loop to try out new features.