Bump pillow from 6.1.0 to 6.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.1.0 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@6.1.0...6.2.0)

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

Author: dependabot[bot]

requirements.txt

@@ -44,7 +44,7 @@ parso==0.5.1
 patsy==0.5.1
 pexpect==4.7.0
 pickleshare==0.7.5
-Pillow==6.1.0
+Pillow==6.2.0
 plotly==4.0.0
 plotly-express==0.4.0
 plotnine==0.5.1