README.md in stripe-5.37.0 vs README.md in stripe-5.38.0

@@ -250,9 +250,10 @@
 - `method`: HTTP method. (`Symbol`)
 - `num_retries`: The number of retries. (`Integer`)
 - `path`: Request path. (`String`)
 - `user_data`: A hash on which users may have set arbitrary data in
   `request_begin`. See above for more information. (`Hash`)
+- `request_id`. HTTP request identifier.
 
 #### Example
 
 For example: