style: add gosimple linter and gofmt linter (#1242)

.golangci.yml

@@ -9,3 +9,5 @@ linters:
     - revive
     - staticcheck
     - govet
+    - gosimple
+    - gofmt

metadata/metadata.go

@@ -47,7 +47,7 @@ func (m Metadata) Set(key string, value string) {
 func (m Metadata) Range(f func(k, v string) bool) {
 	for k, v := range m {
 		ret := f(k, v)
-		if ret == false {
+		if !ret {
 			break
 		}
 	}

transport/http/binding/encode.go

@@ -28,7 +28,7 @@ func EncodeURL(pathTemplate string, msg proto.Message, needQuery bool) string {
 	if reg == nil {
 		return pathTemplate
 	}
-	pathParams := make(map[string]struct{}, 0)
+	pathParams := make(map[string]struct{})
 	path := reg.ReplaceAllStringFunc(pathTemplate, func(in string) string {
 		if len(in) < 4 {
 			return in