https://github.com/neoclide/coc.nvim
https://github.com/neoclide/coc-git
https://github.com/neoclide/coc-tabnine
    https://www.tabnine.com/
    https://www.tabnine.com/faq#special_commands
https://github.com/neoclide/coc-java

https://gitter.im/neoclide/coc.nvim

2020
https://www.reddit.com/r/vim/comments/ip6vpf/ways_to_configure_coc_neoclide_cocnvim/