Bumped v4.1.5

Signed-off-by: Vishal Rana <vr@labstack.com>

echo.go

@@ -224,7 +224,7 @@ const (
 
 const (
 	// Version of Echo
-	Version = "4.1.4"
+	Version = "4.1.5"
 	website = "https://echo.labstack.com"
 	// http://patorjk.com/software/taag/#p=display&f=Small%20Slant&t=Echo
 	banner = `

group.go

@@ -25,11 +25,8 @@ func (g *Group) Use(middleware ...MiddlewareFunc) {
 	}
 	// Allow all requests to reach the group as they might get dropped if router
 	// doesn't find a match, making none of the group middleware process.
-	for _, p := range []string{"", "/*"} {
-		g.Any(p, func(c Context) error {
-			return NotFoundHandler(c)
-		})
-	}
+	g.Any("", NotFoundHandler)
+	g.Any("/*", NotFoundHandler)
 }
 
 // CONNECT implements `Echo#CONNECT()` for sub-routes within the Group.

router.go

@@ -57,7 +57,7 @@ func NewRouter(e *Echo) *Router {
 func (r *Router) Add(method, path string, h HandlerFunc) {
 	// Validate path
 	if path == "" {
-		panic("echo: path cannot be empty")
+		path = "/"
 	}
 	if path[0] != '/' {
 		path = "/" + path