update notice

README.md

@@ -49,6 +49,7 @@ size_categories:
 
 **Important Notice:**
 - A subset of the URL dataset is from Kaggle, and the Kaggle datasets contained 10%-15% mislabelled data. See [this dicussion I opened](https://www.kaggle.com/datasets/sid321axn/malicious-urls-dataset/discussion/431505) for some false positives. I have contacted Kaggle regarding their erroneous "Usability" score calculation for these unreliable datasets.
+- The feature extraction methods shown here are not robust at all in 2023, and there're even silly mistakes in 3 functions: `not_indexed_by_google`, `domain_registration_length`, and `age_of_domain`.
 
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