Bump pillow from 8.2.0 to 8.3.2 (#34)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.2.0 to 8.3.2.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.2.0...8.3.2)

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

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dev-requirements.txt

@@ -3,4 +3,4 @@ black==20.8b1
 pytest==6.2.3
 flake8==3.9.0
 mypy==0.812
-pillow==8.2.0
+pillow==8.3.2