Update project authors statements to Dartino

platforms/stm/disco_fletch/src/freertos.cc

-// Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
+// Copyright (c) 2015, the Dartino project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 #include <FreeRTOS.h>
 #include <task.h>
 
 #include "src/shared/assert.h"
 
 // Hook called by FreeRTOS when a stack overflow is detected.
 extern "C" void vApplicationStackOverflowHook(
     xTaskHandle xTask, signed char *pcTaskName) {
   FATAL("Stack overflow.\n");
 }
 
 // Hook called by FreeRTOS when allocation failed.
 extern "C" void vApplicationMallocFailedHook() {
   FATAL("Out of memory.\n");
 }