Add flake8-builtins options to README (#2173)

README.md

@@ -2701,6 +2701,25 @@ extend-immutable-calls = ["fastapi.Depends", "fastapi.Query"]
 
 ---
 
+### `flake8-builtins`
+
+#### [`builtins-ignorelist`](#builtins-ignorelist)
+
+Ignore list of builtins.
+
+**Default value**: `[]`
+
+**Type**: `Vec<String>`
+
+**Example usage**:
+
+```toml
+[tool.ruff.flake8-builtins]
+builtins-ignorelist = ["id"]
+```
+
+---
+
 ### `flake8-errmsg`
 
 #### [`max-string-length`](#max-string-length)

src/settings/options.rs

@@ -428,6 +428,7 @@ pub struct Options {
     #[option_group]
     /// Options for the `flake8-bugbear` plugin.
     pub flake8_bugbear: Option<flake8_bugbear::settings::Options>,
+    #[option_group]
     /// Options for the `flake8-builtins` plugin.
     pub flake8_builtins: Option<flake8_builtins::settings::Options>,
     #[option_group]