Deprecate ruby and update mdformat

[JingweiZhang12]

No description provided.

[codecov]

Codecov Report

Merging #591 (eef37b6) into master (2542848) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #591      +/-   ##
==========================================
- Coverage   73.53%   73.39%   -0.14%     
==========================================
  Files         130      130              
  Lines        8074     8074              
  Branches     1564     1564              
==========================================
- Hits         5937     5926      -11     
- Misses       1648     1658      +10     
- Partials      489      490       +1     

Flag	Coverage Δ
unittests	73.30% <ø> (-0.13%)	⬇️

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Impacted Files	Coverage Δ
mmtrack/models/trackers/tracktor_tracker.py	63.95% <0.00%> (-15.12%)	⬇️
mmtrack/datasets/pipelines/transforms.py	90.13% <0.00%> (-0.23%)	⬇️
mmtrack/models/sot/siamrpn.py	81.56% <0.00%> (+1.67%)	⬆️

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