Update README.md

[Yshuo-Li]

No description provided.

[innerlee]

CN README needs update as well

[codecov]

Codecov Report

Merging #284 (88edac8) into master (29d6487) will increase coverage by 0.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #284      +/-   ##
==========================================
+ Coverage   79.99%   80.54%   +0.55%     
==========================================
  Files         160      162       +2     
  Lines        8003     8091      +88     
  Branches     1185     1192       +7     
==========================================
+ Hits         6402     6517     +115     
+ Misses       1456     1429      -27     
  Partials      145      145              

Flag	Coverage Δ
unittests	80.54% <ø> (+0.55%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/core/export/wrappers.py	88.37% <0.00%> (ø)
mmedit/core/export/__init__.py	100.00% <0.00%> (ø)
mmedit/models/mattors/dim.py	82.69% <0.00%> (+1.92%)	⬆️
mmedit/models/mattors/base_mattor.py	85.41% <0.00%> (+3.12%)	⬆️
.../models/backbones/encoder_decoders/encoders/vgg.py	98.33% <0.00%> (+5.00%)	⬆️
...ckbones/encoder_decoders/decoders/plain_decoder.py	100.00% <0.00%> (+33.70%)	⬆️

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[Yshuo-Li]

CN README needs update as well
Will update CN README after finish EN README updating.