fix flow chart

[xiaoliu10]

What this PR does:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

Codecov Report

Merging #205 (d257134) into develop (ffc58b6) will increase coverage by 1.00%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #205      +/-   ##
===========================================
+ Coverage    39.35%   40.36%   +1.00%     
===========================================
  Files           39       39              
  Lines         1987     2356     +369     
===========================================
+ Hits           782      951     +169     
- Misses        1107     1303     +196     
- Partials        98      102       +4     

Impacted Files	Coverage Δ
pkg/filter/recovery/recovery.go	69.23% <0.00%> (-8.55%)	⬇️
pkg/filter/logger/logger.go	66.66% <0.00%> (-8.34%)	⬇️
pkg/common/yaml/yaml.go	86.66% <0.00%> (-4.25%)	⬇️
pkg/filter/timeout/timeout.go	90.62% <0.00%> (-1.97%)	⬇️
pkg/filter/authority/authority.go	79.31% <0.00%> (-1.65%)	⬇️
pkg/service/api/discovery_service.go	41.79% <0.00%> (-0.52%)	⬇️
pkg/router/route.go	78.12% <0.00%> (-0.19%)	⬇️
pkg/config/api_config.go	2.48% <0.00%> (-0.01%)	⬇️
pkg/pixiu/http.go	100.00% <0.00%> (ø)
pkg/router/api.go	100.00% <0.00%> (ø)
... and 29 more

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