Added vim to lsp global variables in order to remove warnings

after/plugin/lsp.lua

@@ -8,6 +8,28 @@ lsp.ensure_installed({
   'jedi_language_server',  -- Python
 })
 
+-- Fix undefined global 'vim'
+lsp.configure('lua_ls', {
+    cmd = { 'lua-language-server' },
+    settings = {
+        Lua = {
+            runtime = {
+                version = 'LuaJIT',
+                path = vim.split(package.path, ';'),
+            },
+            diagnostics = {
+                globals = { 'vim' },
+            },
+            workspace = {
+                library = {
+                    [vim.fn.expand('$VIMRUNTIME/lua')] = true,
+                    [vim.fn.expand('$VIMRUNTIME/lua/vim/lsp')] = true,
+                },
+            },
+        },
+    },
+})
+
 lsp.on_attach(function(client, bufnr)
   lsp.default_keymaps({buffer = bufnr})
 end)