Update the installation of MMCV

[GT9505]

mmcv-full is only compiled on PyTorch 1.x.0 because the compatibility usually holds between 1.x.0 and 1.x.1. If your PyTorch version is 1.x.1, you can install mmcv-full compiled with PyTorch 1.x.0 and it usually works well.

[codecov]

Codecov Report

Merging #409 (46b1950) into master (7c4298b) will increase coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
+ Coverage   70.27%   70.58%   +0.31%     
==========================================
  Files         116      116              
  Lines        6113     6113              
  Branches     1181     1181              
==========================================
+ Hits         4296     4315      +19     
+ Misses       1455     1442      -13     
+ Partials      362      356       -6     

Flag	Coverage Δ
unittests	70.52% <ø> (+0.29%)	⬆️

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Impacted Files	Coverage Δ
mmtrack/datasets/sot_train_dataset.py	82.82% <0.00%> (-3.04%)	⬇️
mmtrack/models/sot/siamrpn.py	81.56% <0.00%> (+1.11%)	⬆️
mmtrack/models/trackers/base_tracker.py	86.25% <0.00%> (+1.52%)	⬆️
mmtrack/datasets/pipelines/transforms.py	88.62% <0.00%> (+4.79%)	⬆️
mmtrack/models/reid/base_reid.py	86.95% <0.00%> (+8.69%)	⬆️

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