Bump pillow from 7.0.0 to 7.1.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.0.0 to 7.1.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@7.0.0...7.1.0)

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

requirements.txt

@@ -46,7 +46,7 @@ OpenTimelineIO==0.13.0
 paramiko==2.6.0
 pbr==5.5.0
 pexpect==4.6.0
-Pillow==7.0.0
+Pillow==7.1.0
 protobuf==3.6.1
 pyaaf2==1.4.0
 pycairo==1.16.2