Bump pillow from 8.1.1 to 9.0.0 (#7)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.1 to 9.0.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.1.1...9.0.0)

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

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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==8.1.1
+Pillow==9.0.0
 gunicorn==19.9.0