chore: update go module, readme

readme.md

@@ -5,8 +5,9 @@
 ##### basic usage
 
 - get param
-```go
-func main() {
+
+  ```go
+  func main() {
       app := nf.New()
 
       app.Get("/hello/:name", func(c *nf.Ctx) error {
@@ -15,12 +16,13 @@ func main() {
       })
 
       log.Fatal(app.Run("0.0.0.0:80"))
-}
-```
+  }
+  ```
 
 - parse request query
-```go
-func handleQuery(c *nf.Ctx) error {
+
+  ```go
+  func handleQuery(c *nf.Ctx) error {
       type Req struct {
           Name string   `query:"name"`
           Addr []string `query:"addr"`
@@ -36,12 +38,13 @@ func handleQuery(c *nf.Ctx) error {
       }
 
       return c.JSON(nf.Map{"query": req})
-}
-```
+  }
+  ```
 
 - parse application/json body
-```go
-func handlePost(c *nf.Ctx) error {
+
+  ```go
+  func handlePost(c *nf.Ctx) error {
       type Req struct {
           Name string   `json:"name"`
           Addr []string `json:"addr"`
@@ -63,5 +66,37 @@ func handlePost(c *nf.Ctx) error {
       }
 
       return c.JSON(nf.Map{"struct": req, "map": reqMap})
-}
-```
+  }
+  ```
+
+- pass local value
+
+  ```go
+  type User struct {
+      Id int
+      Username string
+  }
+
+  func main() {
+      app := nf.New()
+      app.Use(auth())
+
+      app.Get("/item/list", list)
+  }
+
+  func auth() nf.HandlerFunc {
+      return func(c *nf.Ctx) error {
+          c.Locals("user", &User{Id: 1, Username:"user"})
+          return c.Next()
+      }
+  }
+
+  func list(c *nf.Ctx) error {
+      user, ok := c.Locals("user").(*User)
+      if !ok {
+          return c.Status(401).SendString("login required")
+      }
+
+      ...
+  }
+  ```