Bump feedgen from 0.7.0 to 0.9.0

Bumps [feedgen](https://github.com/lkiesow/python-feedgen) from 0.7.0 to 0.9.0.
- [Release notes](https://github.com/lkiesow/python-feedgen/releases)
- [Commits](lkiesow/python-feedgen@v0.7.0...v0.9.0)

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

requirements.txt

@@ -19,7 +19,7 @@ django-storages==1.7.1
 djangorestframework==3.9.1
 # dnspython3==1.15.0
 facebook-sdk==3.1.0
-feedgen==0.7.0
+feedgen==0.9.0
 feedparser==5.2.1
 gunicorn==19.9.0
 kombu==4.3.0