fix golint issues

tools/goctl/k8s/k8s.go

@@ -18,8 +18,6 @@ const (
 	ServiceTypeRmq  ServiceType = "rmq"
 	ServiceTypeSync ServiceType = "sync"
 	envDev                      = "dev"
-	envPre                      = "pre"
-	envPro                      = "pro"
 )
 
 type (

tools/goctl/model/sql/parser/parser.go

@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	none = iota
+	_ = iota
 	primary
 	unique
 	normal

tools/goctl/util/stringx/string.go

@@ -53,9 +53,7 @@ func (s String) ToCamel() string {
 
 // camel->snake
 func (s String) ToSnake() string {
-	list := s.splitBy(func(r rune) bool {
-		return unicode.IsUpper(r)
-	}, false)
+	list := s.splitBy(unicode.IsUpper, false)
 	var target []string
 	for _, item := range list {
 		target = append(target, From(item).Lower())