add version notice for other service registry support

[nobodyiam]

What's the purpose of this PR

add version notice for other service registry support

Which issue(s) this PR fixes:

Fixes #4779

Brief changelog

add version notice for nacos-discovery/consul-discovery/zookeeper-discovery/custom-defined-discovery respectively.

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• Update the CHANGES log.

[codecov]

Codecov Report

Merging #4786 (b42db54) into master (bb15bec) will decrease coverage by 0.11%.
The diff coverage is n/a.

❗ Current head b42db54 differs from pull request most recent head 92f5a02. Consider uploading reports for the commit 92f5a02 to get more accurate results

@@             Coverage Diff              @@
##             master    #4786      +/-   ##
============================================
- Coverage     47.33%   47.22%   -0.11%     
+ Complexity     1662     1659       -3     
============================================
  Files           346      346              
  Lines         10684    10683       -1     
  Branches       1064     1063       -1     
============================================
- Hits           5057     5045      -12     
- Misses         5319     5331      +12     
+ Partials        308      307       -1     

see 6 files with indirect coverage changes

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