Neovim 0.5 removes -Z flag

[dstein64]

The next Neovim release, version 0.5, removes the -Z flag (restricted mode), which dstein64/vimgolf (and the official vimgolf) uses to disable external shell commands and other functionality.

This will break vimgolf for users that use Neovim with e.g., GOLF_VIM=nvim.

I reported this same issue to the official vimgolf project.