fix linting (#4)

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

util/http/options.go

@@ -2,12 +2,15 @@ package http
 
 import "github.com/unistack-org/micro/v3/router"
 
+// Options struct
 type Options struct {
 	Router router.Router
 }
 
+// Option func
 type Option func(*Options)
 
+// WithRouter sets the router.Router option
 func WithRouter(r router.Router) Option {
 	return func(o *Options) {
 		o.Router = r