fmt & tidy

go.mod

@@ -5,7 +5,6 @@ require (
 	github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5
 	github.com/aliyun/alibaba-cloud-sdk-go v0.0.0-20190802083043-4cd0c391755e // indirect
 	github.com/apache/dubbo-go-hessian2 v1.2.5-0.20191029001541-894e45c9aaaa
-	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869
 	github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23 // indirect
 	github.com/coreos/bbolt v1.3.3 // indirect
 	github.com/coreos/etcd v3.3.13+incompatible

protocol/grpc/protoc-gen-dubbo/main.go

@@ -28,7 +28,7 @@ import (
 	_ "github.com/golang/protobuf/protoc-gen-go/grpc"
 )
 
-import(
+import (
 	_ "github.com/apache/dubbo-go/protocol/grpc/protoc-gen-dubbo/plugin/dubbo"
 )