Bump pillow from 5.4.1 to 6.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 5.4.1 to 6.2.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@5.4.1...6.2.0)

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

Author: dependabot[bot]

Pipfile

@@ -44,7 +44,7 @@ whitenoise = "==4.1.2"
 Django = ">=2.1.11"
 django_compressor = "==2.2"
 draftjs_exporter = "==2.1.5"
-Pillow = "==5.4.1"
+Pillow = "==6.2.0"
 Unidecode = "==1.0.23"
 Willow = "==1.3"
 psycopg2-binary = "*"