Bump pillow from 8.1.1 to 8.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.1 to 8.2.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.1.1...8.2.0)

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

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

requirements.txt

@@ -7,7 +7,7 @@ gunicorn==19.7.1
 html5lib==1.0b10
 httplib2==0.19.0
 mysqlclient==1.3.12
-Pillow==8.1.1
+Pillow==8.2.0
 psycopg2==2.7.4
 PyPDF2==1.26.0
 pytz==2018.3