feat(unison): do not use lspconfig.util

Author: TheRealLorenz

lsp/unison.lua

@@ -2,14 +2,13 @@
 ---
 --- https://github.com/unisonweb/unison/blob/trunk/docs/language-server.markdown
 
-local util = require 'lspconfig.util'
-
 return {
   cmd = { 'nc', 'localhost', os.getenv 'UNISON_LSP_PORT' or '5757' },
   filetypes = { 'unison' },
   root_dir = function(bufnr, on_dir)
-    local fname = vim.api.nvim_buf_get_name(bufnr)
-    on_dir(util.root_pattern('*.u')(fname))
+    on_dir(vim.fs.root(bufnr, function(name, _)
+      return vim.glob.to_lpeg('*.u'):match(name) ~= nil
+    end))
   end,
   settings = {},
 }