Update project authors statements to Dartino

platforms/stm/disco_fletch/disco_fletch.gyp

-# 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.
 
 {
   'target_defaults': {
     'include_dirs': [
       '<(stm32_cube_f7)/Drivers/CMSIS/Include/',
       '<(stm32_cube_f7)/Drivers/CMSIS/Device/ST/STM32F7xx/Include/',
       '<(stm32_cube_f7)/Drivers/BSP/STM32746G-Discovery/',
       '<(stm32_cube_f7)/Drivers/BSP/Components/Common/',
@@ skipping 252 matching lines @@
           'action': [
             '<(DEPTH)/tools/lk/flash-image.sh',
             '--disco',
             '<(PRODUCT_DIR)/disco_fletch.bin',
           ],
         },
       ],
     },
   ],
 }