Add missing type

Author: stoned

type-graph.txt

@@ -172,6 +172,7 @@ class IO::Path::QNX                 is IO::Path
 role  IO::Socket
 class IO::Socket::INET                             does IO::Socket
 class IO::Socket::Async
+class IO::Socket::Async::ListenSocket              is Tap
 class IO::Spec
 class IO::Spec::Unix                is IO::Spec
 class IO::Spec::Win32               is IO::Spec::Unix