Bump pillow from 4.2.1 to 6.2.0 (#218)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 4.2.1 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@4.2.1...6.2.0)

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

Author: dependabot[bot]

example/requirements.txt

@@ -4,4 +4,4 @@
 -e ../
 
 django-autofixture==0.12.1
-Pillow==4.2.1
+Pillow==6.2.0

requirements_test.txt

@@ -2,7 +2,7 @@ coverage==4.1
 mock>=1.0.1
 flake8>=2.1.0
 tox>=1.7.0
-Pillow==4.2.1
+Pillow==6.2.0
 
 
 # Additional test requirements go here