combine swagger file to one

[cy-zheng]

the cmd like this:
protoc src/pb/proto/models.proto src/pb/proto/models2.proto --swagger_out=allow_merge=true,merge_file_name=myswagger,logtostderr=true:src/static/

[codecov-io]

Codecov Report

Merging #643 into master will decrease coverage by 0.85%.
The diff coverage is 8.62%.

@@            Coverage Diff             @@
##           master     #643      +/-   ##
==========================================
- Coverage   58.94%   58.08%   -0.86%     
==========================================
  Files          30       30              
  Lines        2857     2899      +42     
==========================================
  Hits         1684     1684              
- Misses       1010     1051      +41     
- Partials      163      164       +1

Impacted Files	Coverage Δ
protoc-gen-swagger/genswagger/generator.go	0% <0%> (ø)	⬆️
protoc-gen-grpc-gateway/descriptor/registry.go	71.03% <0%> (-3.25%)	⬇️
protoc-gen-swagger/genswagger/template.go	42.1% <100%> (-0.25%)	⬇️
protoc-gen-swagger/main.go	27.38% <42.85%> (+1.4%)	⬆️

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[wanghong230]

This is the feature I am looking for.