Update struct level validation in README

Struct-level validation has been changed in b31fd25cc5cec96ccee737ba1313c6e9f702f32a, but it appears the README was not completely updated: the return value for struct-level validation refers to the old functionality.

1 files changed, 2 insertions, 4 deletions

diff --git a/README.md b/README.md
index ccec4e7..e54e635 100644
--- a/README.md
+++ b/README.md
@@ -280,14 +280,12 @@ struct CategoryData {
 }
 ```
 
-The function mentioned should return a `Option<(String, String)>` where the tuple is (key error, error code)
-and will be called after validation is done for all fields.
-This means that the error can be reported on an existing field or on a new key.
+The function mentioned should return a `Result<(), ValidationError>` and will be called after validation is done for all fields.
 
 The `skip_on_field_errors` defaults to `true` if not present and will ensure that the function is not called
 if an error happened while validating the struct fields.
 
-Any error on the schema level validation will appear in the key `__all__` of the hashmap of errors.
+Any error on the struct level validation will appear in the key `__all__` of the hashmap of errors.
 
 ## Message and code