Update version to 0.20.1 on the 0.20 branch

[AdeelH]

No description provided.

[codecov]

Codecov Report

Merging #1640 (f4a24bf) into 0.20 (e5b2ffa) will decrease coverage by 0.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             0.20    #1640      +/-   ##
==========================================
- Coverage   75.69%   75.30%   -0.39%     
==========================================
  Files         192      192              
  Lines        9254     9254              
==========================================
- Hits         7005     6969      -36     
- Misses       2249     2285      +36     

Impacted Files	Coverage Δ
...ervision/pytorch_learner/object_detection_utils.py	57.06% <0.00%> (-18.65%)	⬇️
...vision/pytorch_learner/object_detection_learner.py	87.69% <0.00%> (-3.08%)	⬇️
...er/dataset/visualizer/classification_visualizer.py	97.36% <0.00%> (-2.64%)	⬇️

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