Update to 1.994
    
    - New upstream release 1.994
      - IO::Socket::SSL can now be used as dual-use socket, e.g. start plain,
        upgrade to SSL and downgrade again all with the same object; see
        documentation of SSL_startHandshake and chapter Advanced Usage
      - Try to apply SSL_ca* even if verify_mode is 0, but don't complain if this
        fails; this is needed if one wants to explicitly verify OCSP lookups even
        if verification is otherwise off, because otherwise the signature check
        would fail (this is mostly useful for testing)
      - Reorder documentation of attributes for new, so that the more important
        ones are at the top