Enable nvim omni completion

.config/nvim/init.vim

@@ -12,6 +12,9 @@ highlight CursorLine guibg=#303000 ctermbg=234
 " https://begriffs.com/posts/2019-07-19-history-use-vim.html?hn=3#backups-and-undo
 runtime swap.vim
 
+" enable <C-X><C-O> omni completion
+set omnifunc=syntaxcomplete#Complete
+" more advanced deoplete completion
 let g:deoplete#enable_at_startup = 1
 
 " Allow saving of files as sudo when I forgot to start vim using sudo.