protoc-gen-swagger/genswagger: update BUILD.bazel
protoc-gen-swagger/genswagger: update BUILD.bazel

Signed-off-by: Stephan Renatus <3d1a7d0a294b6d8e799ad6e122143905f17f9530@chef.io>

gengo/grpc-gateway,improbable-io/grpc-gateway,gengo/grpc-gateway,improbable-io/grpc-gateway,grpc-ecosystem/grpc-gateway