Bump django-tinymce from 3.6.1 to 3.7.1

Bumps [django-tinymce](https://github.com/jazzband/django-tinymce) from 3.6.1 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@3.6.1...3.7.1)

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

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

requirements.txt

@@ -43,7 +43,7 @@ django-guardian<2.4.1
 django-downloadview==2.3.0
 django-polymorphic==3.1.0
 django-tastypie<0.15.0
-django-tinymce==3.6.1
+django-tinymce==3.7.1
 django-grappelli==3.0.8
 django-uuid-upload-path==1.0.0
 django-widget-tweaks==1.5.0