Document --stdin-filepath in README.md (#954)

* Document --stdin-filepath in README.md. Fixes #953

* Update README.md

---------

Co-authored-by: JohnnyMorganz <[email protected]>

Author: notpeter

README.md

@@ -114,6 +114,7 @@ Note that these integrations require the StyLua binary to already be installed a
 
 - Sublime: [Sublime Text Package](https://github.com/aerobounce/Sublime-Pretty-Lua)
 - Neovim: [stylua-nvim](https://github.com/ckipp01/stylua-nvim) / [stylua.nvim](https://github.com/wesleimp/stylua.nvim)
+- Zed: [Zed Lua StyLua formatter settings](https://zed.dev/docs/languages/lua#stylua)
 
 ## Usage
 
@@ -154,6 +155,15 @@ vendor/
 
 running `stylua .` will ignore the `vendor/` directory.
 
+### Filtering when using stdin
+
+If you are formatting stdin by specifying `-` as the filename (usually as part of an editor integration)
+you can optionally provide the filename via `--stdin-filepath`. To respect glob or `.styluaignore` filtering, pass `--respect-ignores`.
+
+```stylua
+stylua --respect-ignores --stdin-filepath src/foo.lua -
+```
+
 ### `--check`: Checking files for formatting
 
 To check whether files require formatting (but not write directly to them), use the `--check` flag.