Update README.md

Author: RyanDaDeng

README.md

@@ -12,7 +12,6 @@ In the future release, I am planning to add the following features:
 - Tests will be covered in future release.
 - Request client driver will be configurable.
 - Field name will be supported in config file
-- Error message will be structured.
 - Combine reCAPTCHA v3 with v2, if v3 fails then pop-up v2 challenge to do second verification.
 
 ## Description