Set default value of proxy.changeOrigin to true

[xuchaoying]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

feat

• What is the related issue? (Use #issue_id to relate an open issue)

no

• Does this PR introduce a breaking change?

Yes, we found that CORS is needed in most development cases, so we changed the default value of proxy.changeOrigin to true now.

• Other information:

[codecov]

Codecov Report

Merging #66 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   90.26%   90.26%           
=======================================
  Files          44       44           
  Lines        1561     1561           
=======================================
  Hits         1409     1409           
  Misses        152      152

Impacted Files	Coverage Δ
...ackages/svrx/lib/plugin/svrx-plugin-proxy/index.js	64.47% <ø> (ø)	⬆️

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