Bump chardet from 3.0.4 to 4.0.0

Bumps [chardet](https://github.com/chardet/chardet) from 3.0.4 to 4.0.0.
- [Release notes](https://github.com/chardet/chardet/releases)
- [Commits](chardet/chardet@3.0.4...4.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -3,7 +3,7 @@ beautifulsoup4==4.9.3
 bleach==3.2.1
 cachetools==4.2.0
 certifi==2020.12.5
-chardet==3.0.4
+chardet==4.0.0
 click==7.1.2
 feedparser==6.0.2
 Flask==1.1.2