Removed md5 checking from meta file

[pmeier]

Fixes #869

[codecov-io]

Codecov Report

Merging #870 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #870      +/-   ##
==========================================
- Coverage   54.52%   54.51%   -0.02%     
==========================================
  Files          36       36              
  Lines        3323     3320       -3     
  Branches      546      546              
==========================================
- Hits         1812     1810       -2     
+ Misses       1377     1376       -1     
  Partials      134      134

Impacted Files	Coverage Δ
torchvision/datasets/imagenet.py	21.55% <0%> (-1.14%)	⬇️

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[fmassa]

Thanks!