Bump pillow from 6.0.0 to 6.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.0.0 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@6.0.0...6.2.0)

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

requirements.txt

@@ -10,7 +10,7 @@ jupyter==1.0.0
 matplotlib==3.1.0
 numpy==1.16.4
 pandas==0.24.2
-Pillow==6.0.0
+Pillow==6.2.0
 pyproj==2.2.0
 pytz==2019.1
 rasterio==1.0.24