Fix readme typo

[innerpeacez]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes https://github.com/apache/skywalking/issues/.
• Update the CHANGES log.

[codecov-commenter]

Codecov Report

Merging #288 (db47aa1) into main (25fb9cb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #288   +/-   ##
=======================================
  Coverage   44.88%   44.88%           
=======================================
  Files          93       93           
  Lines        9632     9632           
=======================================
  Hits         4323     4323           
  Misses       4895     4895           
  Partials      414      414           

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