message: Turn magic numbers into a named constant.
diff: @@ -97,6 +97,7 @@ namespace eos {
  class connection : public std::enable_shared_from_this<connection> {
  public:
  + const size_t BufferSize{1024*1024*4};
  connection( string endpoint )
  : block_state(),
  trx_state(),
  @@ -104,8 +105,8 @@ namespace eos {
  sync_requested(),
  socket( std::make_shared<tcp::socket>( std::ref( app().get_io_service() ))),
  pending_message_size(0),
  - pending_message_buffer(1024*1024*4),
  - send_buffer(1024*1024*4),
  + pending_message_buffer(BufferSize),
  + send_buffer(BufferSize),
  remote_node_id(),
  last_handshake(),
  out_queue(),
  @@ -124,8 +125,8 @@ namespace eos {
  sync_requested(),
  socket( s ),
  pending_message_size(0),
  - pending_message_buffer(1024*1024*4),
  - send_buffer(1024*1024*4),
  + pending_message_buffer(BufferSize),
  + send_buffer(BufferSize),
  remote_node_id(),
  last_handshake(),
  out_queue(),
  