update dubbo-spring-boot-autoconfigure/README.md

[EZKAYOTWJPRKXWCUYEEB]

#647

[codecov-io]

Codecov Report

Merging #669 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #669   +/-   ##
========================================
  Coverage      79.1%   79.1%           
  Complexity      213     213           
========================================
  Files            40      40           
  Lines           651     651           
  Branches         66      66           
========================================
  Hits            515     515           
  Misses          106     106           
  Partials         30      30

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