Close handle when closing the stream

At the end of the connection, each side sends a close_notify alert to
inform the peer that the connection is closed. IO::Socket::SSL does
that, if its close method is called.

lib/Mojo/IOLoop/Stream.pm

@@ -24,6 +24,7 @@ sub close {
   return unless my $reactor = $self->reactor;
   return unless my $handle  = delete $self->timeout(0)->{handle};
   $reactor->remove($handle);
+  $handle->close;
   $self->emit('close');
 }