docs(readme): correct quick setup keymap snippet

README.md

@@ -132,7 +132,7 @@ Some suggestions:
 -- ~/.config/nvim/after/ftplugin/haskell.lua
 local ht = require('haskell-tools')
 local bufnr = vim.api.nvim_get_current_buf()
-local def_opts = { noremap = true, silent = true, buffer = bufnr, }
+local opts = { noremap = true, silent = true, buffer = bufnr, }
 -- haskell-language-server relies heavily on codeLenses,
 -- so auto-refresh (see advanced configuration) is enabled by default
 vim.keymap.set('n', '<space>ca', vim.lsp.codelens.run, opts)
@@ -145,7 +145,7 @@ vim.keymap.set('n', '<leader>rr', ht.repl.toggle, opts)
 -- Toggle a GHCi repl for the current buffer
 vim.keymap.set('n', '<leader>rf', function()
   ht.repl.toggle(vim.api.nvim_buf_get_name(0))
-end, def_opts)
+end, opts)
 vim.keymap.set('n', '<leader>rq', ht.repl.quit, opts)
 ```