make_printable replaces buffers rename (API Change):

* The function buffers is deprecated, use the new
  function make_printable as the replacement.

Actions Required:

* Replace call sites to use make_printable instead of buffers,
  and also include make_printable.hpp instead of ostream.hpp.

example/websocket/client/async/websocket_client_async.cpp

@@ -173,8 +173,8 @@ public:
 
         // If we get here then the connection is closed gracefully
 
-        // The buffers() function helps print a ConstBufferSequence
-        std::cout << beast::buffers(buffer_.data()) << std::endl;
+        // The make_printable() function helps print a ConstBufferSequence
+        std::cout << beast::make_printable(buffer_.data()) << std::endl;
     }
 };