Update project authors statements to Dartino

platforms/stm/disco_fletch/src/page_allocator_test.cc

-// 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.
 
 #include <stdio.h>
 #include <cinttypes>
 
 #define TESTING
 #include "src/shared/assert.h"
 #include "src/shared/atomic.h"
 
@@ skipping 85 matching lines @@
     EXPECT_EQ(0xaa, map[i]);
   }
 
   free(arena);
 }
 
 int main(int argc, char** argv) {
   Test();
   TestExternalMap();
 }