Update project authors statements to Dartino

platforms/stm/stm_targets.gypi

-# 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.
 
 {
   'variables': {
     'posix': 0,
 
     'stm32_cube_f7': '<(DEPTH)/third_party/stm/stm32cube_fw_f7',
     'stm32_cube_f7_free_rtos':
       '<(stm32_cube_f7)/Middlewares/Third_Party/FreeRTOS',
@@ skipping 194 matching lines @@
                   '<@(common_cross_gcc_debug_cflags)',
                 ],
               }],
             ],
           }],
         ],
       },
     },
   },
 }