PILLOW_VERSION deprecation updates

[surgan12]

Closes #1490.

cc: @fmassa

[codecov-io]

Codecov Report

Merging #1501 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1501   +/-   ##
=======================================
  Coverage   64.43%   64.43%           
=======================================
  Files          83       83           
  Lines        6424     6424           
  Branches      983      983           
=======================================
  Hits         4139     4139           
  Misses       1994     1994           
  Partials      291      291

Impacted Files	Coverage Δ
torchvision/transforms/functional.py	71.06% <100%> (ø)	⬆️

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[fmassa]

Thanks for the PR!