Fix pypi label in README.md

[ly015]

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[codecov]

Codecov Report

Merging #867 (c1dbdde) into master (29f5a0c) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head c1dbdde differs from pull request most recent head abcbf61. Consider uploading reports for the commit abcbf61 to get more accurate results

@@           Coverage Diff           @@
##           master     #867   +/-   ##
=======================================
  Coverage   83.59%   83.59%           
=======================================
  Files         176      176           
  Lines       14145    14145           
  Branches     2364     2364           
=======================================
+ Hits        11824    11825    +1     
  Misses       1713     1713           
+ Partials      608      607    -1     

Flag	Coverage Δ
unittests	83.52% <ø> (ø)

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Impacted Files	Coverage Δ
mmpose/datasets/pipelines/shared_transform.py	88.50% <0.00%> (+0.50%)	⬆️

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