Merge pull request #9 from ttys3/master

fix(echo): avoid duplicated body response

echo/echo.go

@@ -11,6 +11,9 @@ func New(doc redoc.Redoc) echo.MiddlewareFunc {
 	return func(next echo.HandlerFunc) echo.HandlerFunc {
 		return func(ctx echo.Context) error {
 			handle(ctx.Response(), ctx.Request())
+			if ctx.Response().Committed {
+				return nil
+			}
 			return next(ctx)
 		}
 	}