<doc>(changeLog): update 3.4.0 change log.

[kyonRay]

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.72 🎉

Comparison is base (49c82bc) 39.68% compared to head (cd6d2f6) 40.40%.

❗ Current head cd6d2f6 differs from pull request most recent head b7da799. Consider uploading reports for the commit b7da799 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #790      +/-   ##
============================================
+ Coverage     39.68%   40.40%   +0.72%     
- Complexity     1996     2014      +18     
============================================
  Files           385      385              
  Lines         14837    14837              
  Branches       1717     1717              
============================================
+ Hits           5888     5995     +107     
+ Misses         8420     8313     -107     
  Partials        529      529              

Impacted Files	Coverage Δ
.../java/org/fisco/bcos/sdk/v3/client/ClientImpl.java	46.43% <ø> (+4.53%)	⬆️

... and 15 files with indirect coverage changes

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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