Update project authors statements to Dartino

src/pkg/power_management/power_management_extension_macos.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.
 
 #if defined(FLETCH_TARGET_OS_MACOS)
 
 #include <IOKit/pwr_mgt/IOPMLib.h>
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
@@ skipping 12 matching lines @@
   } else {
     return -1;
   }
 }
 
 void HandleEnableSleep(int64_t disable_id) {
   IOPMAssertionRelease(disable_id);
 }
 
 #endif  // FLETCH_TARGET_OS_MACOS