[Fix] Fix broken URLs in GMA README

[MeowZheng]

fix #91

[codecov]

Codecov Report

Merging #93 (4de24d6) into master (62cc403) will increase coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   67.74%   68.02%   +0.28%     
==========================================
  Files          86       86              
  Lines        4895     4895              
  Branches      705      705              
==========================================
+ Hits         3316     3330      +14     
+ Misses       1471     1457      -14     
  Partials      108      108              

Flag	Coverage Δ
unittests	68.02% <ø> (+0.28%)	⬆️

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Impacted Files	Coverage Δ
mmflow/datasets/pipelines/transforms.py	79.83% <0.00%> (+2.33%)	⬆️

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