Bump pillow from 8.0.1 to 8.1.2 (#30)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.0.1 to 8.1.2.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.0.1...8.1.2)

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setup.py

@@ -33,7 +33,7 @@
         "h5py~=2.10.0",
         "loguru==0.5.3",
         "opensimplex==0.3",
-        "Pillow==8.0.1",
+        "Pillow==8.1.2",
         "protobuf<4,>=3.7",
         "six~=1.15.0",
         "tensorflow_addons==0.12.0",