Update charset-normalizer requirement from <3 to <4

Updates the requirements on [charset-normalizer](https://github.com/Ousret/charset_normalizer) to permit the latest version.
- [Release notes](https://github.com/Ousret/charset_normalizer/releases)
- [Changelog](https://github.com/Ousret/charset_normalizer/blob/master/CHANGELOG.md)
- [Commits](jawah/charset_normalizer@0.1-alpha...3.1.0)

---
updated-dependencies:
- dependency-name: charset-normalizer
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

setup.py

@@ -7,7 +7,7 @@
 requires = [
     'arrow>=0.12.1,<1.3',
     'attrs>=17.4.0',
-    'charset-normalizer<3',
+    'charset-normalizer<4',
     'docopt>=0.6.2',
     'dogpile.cache>=0.6.5,<2',
     'pandas>=1.3,<2.1',