Bump pillow from 5.2.0 to 6.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 5.2.0 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](python-pillow/Pillow@5.2.0...6.2.0)

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

requirements.txt

@@ -12,7 +12,7 @@ kivyunittest==0.1.8
 layoutmargin==20190911
 mypy==0.730
 oscpy==0.3.0
-Pillow==5.2.0
+Pillow==6.2.0
 plyer==1.3.1
 pyetheroll==20191108
 pytest