Update resnet.py

[shinji411]

The original code "from .utils import load_state_dict_from_url" is not applicable.
you connot import load_state_dict_from_url from .utils.
change ".utils" to "torch.hub" can fix the problem.

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[codecov]

Codecov Report

Merging #3522 (cf97441) into master (c991db8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3522   +/-   ##
=======================================
  Coverage   78.70%   78.70%           
=======================================
  Files         105      105           
  Lines        9735     9735           
  Branches     1563     1563           
=======================================
  Hits         7662     7662           
  Misses       1582     1582           
  Partials      491      491           

Impacted Files	Coverage Δ
torchvision/models/resnet.py	90.41% <100.00%> (ø)

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[datumbox]

@shinji411 Sorry unfortunately we can't merge this one as it will break code on the FB side. The import at question is necessary to be imported as-is to enable FB-specific functionalities.