WordTokenizer conflict with nltk >= 3.8.2

[ansesame]

First, thanks for the library. Second, I found a problem with the requirements after the release of nltk == 3.8.2 for WordTokenizer

The aforementioned nltk == 3.8.2 solves a remote code execution vulnerability, disabled to obtain "punkt" and replaced it with "punkt_tab".
Issues:

• Remote code execution vulnerability in NLTK nltk/nltk#3266 (comment)
• [BUG] punkt_tab breaking change nltk/nltk#3293

This creates a problem with newspaper3k when downloading "punkt" in REQUIERED_CORPORA. Then I suggest modify REQUIRED_CORPORA or updating the requierements.py to avoid using nltk >= 3.8.2