Bump chardet from 3.0.4 to 4.0.0 (#74)

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] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -3,7 +3,7 @@ aiodns==1.1.1
 aiohttp>=3.4
 async_timeout>=3.0.1
 attrs==20.3.0
-chardet==3.0.4
+chardet==4.0.0
 idna==2.7
 multidict==5.1.0
 pycares==2.3.0

requirements_dev.txt

@@ -3,7 +3,7 @@ astroid==2.0.4
 bleach==3.2.2
 certifi==2018.10.15
 cffi==1.11.5
-chardet==3.0.4
+chardet==4.0.0
 cmarkgfm==0.4.2
 docutils==0.14
 flake8==3.5.0