[SCB-2346] fix ServiceComb-Service-Center Http API link of service-ce…

[david6969xin]

…nter-client README.md is invalid

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[codecov-commenter]

Codecov Report

Merging #2608 (3ca2b08) into master (ad0dc90) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2608      +/-   ##
============================================
+ Coverage     77.69%   77.73%   +0.03%     
- Complexity     1428     1429       +1     
============================================
  Files          1598     1598              
  Lines         42626    42652      +26     
  Branches       3591     3591              
============================================
+ Hits          33119    33154      +35     
+ Misses         8006     7999       -7     
+ Partials       1501     1499       -2     

Impacted Files	Coverage Δ
.../src/main/java/io/protostuff/ProtobufOutputEx.java	79.94% <0.00%> (-0.06%)	⬇️
...ringmvc/client/CodeFirstRestTemplateSpringmvc.java	96.02% <0.00%> (+0.16%)	⬆️
...vicecomb/demo/pojo/client/CodeFirstPojoClient.java	98.31% <0.00%> (+0.22%)	⬆️
...egistry/client/http/ServiceRegistryClientImpl.java	71.26% <0.00%> (+1.14%)	⬆️
...mb/serviceregistry/client/http/RestClientUtil.java	80.55% <0.00%> (+1.85%)	⬆️
...ache/servicecomb/foundation/common/net/IpPort.java	86.66% <0.00%> (+3.33%)	⬆️

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