执行命令：
protoc --go_out=./ ./a.proto
报错：
ERROR: 2020/10/21 11:54:10 [profiling] error parsing flags: when -address isn't specified, you must include -stream-stats-catapult-json --go_out: protoc-gen-go: Plugin failed with status code 1.
解决：（原因：找不到protoc-gen-go可执行文件路径）
protoc --plugin=protoc-gen-go=../../bin/protoc-gen-go.exe --go_out=plugins=grpc:./ ./helloworld/helloworld.p roto