Update project authors statements to Dartino

platforms/stm/disco_fletch/src/page_allocator.h

-// Copyright (c) 2016, the Fletch project authors. Please see the AUTHORS file
+// Copyright (c) 2016, 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.
 
 #ifndef PLATFORMS_STM_DISCO_FLETCH_SRC_PAGE_ALLOCATOR_H_
 #define PLATFORMS_STM_DISCO_FLETCH_SRC_PAGE_ALLOCATOR_H_
 
 #include <cinttypes>
 #include <cstdlib>
 #include <cstring>
 
@@ skipping 50 matching lines @@
     size_t pages_;
     uint8_t* base_;
     uint8_t* map_;
   };
 
   static const int kMaxArenas = 3;
   Arena arenas_[kMaxArenas];
 };
 
 #endif  // PLATFORMS_STM_DISCO_FLETCH_SRC_PAGE_ALLOCATOR_H_