Problem: filetype: goaccess config file not recognized
Solution: detect 'goaccess.conf' as goaccess filetype, also
include a basic syntax and ftplugin (Adam Monsen)
Add syntax highlighting for GoAccess configuration file.
GoAccess is a real-time web log analyzer and interactive viewer that
runs in a terminal in *nix systems or through your browser.
GoAccess home page: https://goaccess.iocloses: vim/vim#154140aa65b48fb
Co-authored-by: Adam Monsen <haircut@gmail.com>
