Bump django-tinymce from 2.7.1 to 3.7.1 in /codalab/requirements

Bumps [django-tinymce](https://github.com/jazzband/django-tinymce) from 2.7.1 to 3.7.1.
- [Release notes](https://github.com/jazzband/django-tinymce/releases)
- [Changelog](https://github.com/jazzband/django-tinymce/blob/master/CHANGELOG.rst)
- [Commits](jazzband/django-tinymce@2.7.1...3.7.1)

---
updated-dependencies:
- dependency-name: django-tinymce
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

codalab/requirements/requirements.txt

@@ -22,7 +22,7 @@ django-mptt==0.9.1
 django-nose==1.4.6
 django-oauth-toolkit==0.11.0
 django-storages==1.9.1
-django-tinymce==2.7.1
+django-tinymce==3.7.1
 djangorestframework==3.8.2
 mock==1.0.1
 oauthlib==1.1.2