Bump pillow from 6.2.0 to 7.1.0 (#3)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.0 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@6.2.0...7.1.0)

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

Author: dependabot[bot]

requirements.txt

@@ -2,5 +2,5 @@ Flask==1.0.3
 https://download.pytorch.org/whl/cpu/torch-1.0.0-cp37-cp37m-linux_x86_64.whl
 torchvision==0.2.1
 numpy==1.16.4
-Pillow==6.2.0
+Pillow==7.1.0
 gunicorn==19.9.0