optimize: update README.md(update mailing list and repository urls)

[xingfudeshi]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

update mailing list and repository urls

Ⅱ. Does this pull request fix one issue?

fixes #6185

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[funky-eyes]

#6186 和#6184 有必要分开吗？
Is it necessary to separate #6186 and #6184?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f63b29d) 48.95% compared to head (6ca65bb) 49.00%.
Report is 1 commits behind head on 2.x.

❗ Current head 6ca65bb differs from pull request most recent head 1bbe2bb. Consider uploading reports for the commit 1bbe2bb to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #6186      +/-   ##
============================================
+ Coverage     48.95%   49.00%   +0.04%     
- Complexity     4777     4783       +6     
============================================
  Files           915      915              
  Lines         31890    31890              
  Branches       3853     3853              
============================================
+ Hits          15613    15627      +14     
+ Misses        14715    14700      -15     
- Partials       1562     1563       +1     

see 3 files with indirect coverage changes

[slievrly]

LGTM