fix lsp_signature in readme

README.md

@@ -104,7 +104,7 @@ lvim.plugins = {
     {"folke/tokyonight.nvim"}, {
         "ray-x/lsp_signature.nvim",
         config = function() require"lsp_signature".on_attach() end,
-        event = "InsertEnter"
+        event = "BufRead"
     }
 }
 ```