Would be nice if the JWT middleware had a configuration option Required bool (or maybe an inverse variant for backwards compatibility, can't think of a name)?

Use-case is when you do not want a route to require a JWT, but display different behavior if a JWT is there.

Example:

func restricted(c echo.Context) error {
	user := c.Get("user")
	if user != nil {
		claims := user.(*jwt.Token).Claims.(*jwtCustomClaims)
		name := claims.Name
		return c.String(http.StatusOK, "Welcome "+name+"!")
	} else {
		return c.String(http.StatusOK, "Welcome anonymous!")
	}
}

Currently this would throw a ErrJWTMissing
https://github.com/labstack/echo/blob/master/middleware/jwt.go#L142
and
https://github.com/labstack/echo/blob/master/middleware/jwt.go#L158

Which would be the expected behavior if Required is true.