Bump pillow in /examples/variational-autoencoder/basic-image-recon (c…

…lab#1631)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.0 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@6.2.0...7.1.0)

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

examples/variational-autoencoder/basic-image-recon/requirements.txt

@@ -1,4 +1,4 @@
 Cython==0.28
 dyNET==2.0.3
 numpy==1.14.2
-Pillow==6.2.0
+Pillow==7.1.0