feat: add example for ResponseFilter

[soulbird]

No description provided.

[codecov-commenter]

Codecov Report

Merging #91 (ac83ff8) into master (11c4627) will decrease coverage by 2.40%.
The diff coverage is 79.16%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
- Coverage   82.09%   79.68%   -2.41%     
==========================================
  Files          13       14       +1     
  Lines         877      901      +24     
==========================================
- Hits          720      718       -2     
- Misses        114      137      +23     
- Partials       43       46       +3     

Impacted Files	Coverage Δ
cmd/go-runner/plugins/response_rewrite.go	79.16% <79.16%> (ø)
internal/server/server.go	49.20% <0.00%> (-16.67%)	⬇️

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