Bump version to v0.4.0

[MeowZheng]

As title

[codecov]

Codecov Report

Merging #114 (a7d6737) into master (9cce38e) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
- Coverage   69.40%   69.34%   -0.06%     
==========================================
  Files          92       92              
  Lines        5092     5092              
  Branches      721      721              
==========================================
- Hits         3534     3531       -3     
- Misses       1445     1448       +3     
  Partials      113      113              

Flag	Coverage Δ
unittests	69.34% <100.00%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmflow/version.py	61.53% <100.00%> (ø)
mmflow/datasets/pipelines/transforms.py	79.33% <0.00%> (-0.50%)	⬇️

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