fix use issue

lua/plugins.lua

@@ -15,7 +15,7 @@ vim.cmd [[packadd packer.nvim]]
 -- vim.cmd 'autocmd BufWritePost plugins.lua PackerCompile' -- Auto compile when there are changes in plugins.lua
 
 
-return require('packer').startup(function()
+return require('packer').startup(function(use)
   -- Packer can manage itself as an optional plugin
   use {'wbthomason/packer.nvim', opt = true}