Bump pillow from 7.0.0 to 7.1.0 (#2)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.0.0 to 7.1.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@7.0.0...7.1.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -18,7 +18,7 @@ itsdangerous==1.1.0
 Jinja2==2.11.1
 MarkupSafe==1.1.1
 mongoengine==0.19.1
-Pillow==7.0.0
+Pillow==7.1.0
 pymongo==3.10.1
 python-dateutil==2.8.1
 pytz==2019.3