Update vendor (#1560)

vendor/github.com/labstack/echo/v4/echo.go

@@ -90,6 +90,7 @@ type (
 		HidePort         bool
 		HTTPErrorHandler HTTPErrorHandler
 		Binder           Binder
+		JSONSerializer   JSONSerializer
 		Validator        Validator
 		Renderer         Renderer
 		Logger           Logger
@@ -125,6 +126,12 @@ type (
 		Validate(i interface{}) error
 	}
 
+	// JSONSerializer is the interface that encodes and decodes JSON to and from interfaces.
+	JSONSerializer interface {
+		Serialize(c Context, i interface{}, indent string) error
+		Deserialize(c Context, i interface{}) error
+	}
+
 	// Renderer is the interface that wraps the Render function.
 	Renderer interface {
 		Render(io.Writer, string, interface{}, Context) error
@@ -234,7 +241,7 @@ const (
 
 const (
 	// Version of Echo
-	Version = "4.3.0"
+	Version = "4.4.0"
 	website = "https://echo.labstack.com"
 	// http://patorjk.com/software/taag/#p=display&f=Small%20Slant&t=Echo
 	banner = `
@@ -315,6 +322,7 @@ func New() (e *Echo) {
 	e.TLSServer.Handler = e
 	e.HTTPErrorHandler = e.DefaultHTTPErrorHandler
 	e.Binder = &DefaultBinder{}
+	e.JSONSerializer = &DefaultJSONSerializer{}
 	e.Logger.SetLevel(log.ERROR)
 	e.StdLogger = stdLog.New(e.Logger.Output(), e.Logger.Prefix()+": ", 0)
 	e.pool.New = func() interface{} {