chore(deps): update dependency nltk to v3.8.2 [security]

Author: renovate[bot]

docs/requirements.txt

@@ -27,7 +27,7 @@ mock==4.0.1
 more-itertools==8.2.0
 mypy==0.761
 mypy-extensions==0.4.3
-nltk==3.6.6; python_version > "2.7"
+nltk==3.8.2; python_version > "2.7"
 packaging==20.3
 pathspec==0.7.0
 pluggy==0.13.1