module to use SSL/TLS with IO::Async

 IO::Async::SSL extends existing IO::Async classes with extra methods to allow
 the use of SSL or TLS-based connections using IO::Socket::SSL. It does not
 directly provide any methods or functions of its own.
 .
 Primarily, it provides SSL_connect and SSL_listen, which yield
 IO::Socket::SSL-upgraded socket handles or IO::Async::Stream instances, and
 two forms of SSL_upgrade to upgrade an existing TCP connection to use SSL.
 .
 As an additional convenience, if the SSL_verify_mode and SSL_ca_* options are
 omitted, the module will attempt to provide them by querying the result of
 IO::Socket::SSL's default_ca function. Otherwise, the module will print a
 warning and set SSL_VERIFY_NONE instead.