Boostify the futures example.
diff --git a/asio/boostify.pl b/asio/boostify.pl
index 4ca2fbe..fbb80b8 100755
--- a/asio/boostify.pl
+++ b/asio/boostify.pl
@@ -483,6 +483,7 @@
       "src/examples/cpp11/buffers",
       "src/examples/cpp11/chat",
       "src/examples/cpp11/echo",
+      "src/examples/cpp11/futures",
       "src/examples/cpp11/http/server",
       "src/examples/cpp11/spawn");