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-preview[bot] <support@dependabot.com>

requirements.txt

@@ -3,7 +3,7 @@ attrs==20.3.0
 bcrypt==3.2.0
 certifi==2020.12.5
 cffi==1.14.4
-chardet==3.0.4
+chardet==4.0.0
 colander==1.8.3
 colorama==0.4.4
 cornice==5.0.3