[nvim-lspconfig]: Fallback to dirname(file) as root directory.

.config/nvim/init.vim

@@ -2,13 +2,19 @@ set runtimepath^=~/.vim runtimepath+=~/.vim/after
 let &packpath = &runtimepath
 source ~/.vimrc
 lua << EOF
-require'lspconfig'.julials.setup{
+require'lspconfig'.julials.setup({
     on_new_config = function(new_config, _)
         local julia = vim.fn.expand("~/.julia/environments/nvim-lspconfig/bin/julia")
         if require'lspconfig'.util.path.is_file(julia) then
             new_config.cmd[1] = julia
         end
-    end
+    end,
-}
+    -- This just adds dirname(fname) as a fallback (see nvim-lspconfig#1768).
+    root_dir = function(fname)
+        local util = require'lspconfig.util'
+        return util.root_pattern 'Project.toml'(fname) or util.find_git_ancestor(fname) or
+               util.path.dirname(fname)
+    end,
+})
 EOF
 :nmap K :lua vim.lsp.buf.hover() <CR>