chore(deps): bump idna from 2.9 to 3.7

Bumps [idna](https://github.com/kjd/idna) from 2.9 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.9...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: direct:production
...

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

requirements.txt

@@ -4,7 +4,7 @@ bs4==0.0.1
 certifi==2020.4.5.1
 chardet==3.0.4
 click==7.1.2
-idna==2.9
+idna==3.7
 joblib==0.14.1
 nltk==3.6
 pycodestyle==2.6.0