Bump pillow from 6.1.0 to 6.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.1.0 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](https://github.com/python-pillow/Pillow/compare/6.1.0...6.2.0)

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

requirements.txt

@@ -1,5 +1,5 @@
 numpy==1.16.4
-pillow==6.1.0
+pillow==6.2.0
 opencv-python==4.1.0.25
 rsa==4.0
 torchvision==0.2.2.post3