Add SetDeadline and SetWriteDeadline methods to *ndp.Conn (#25)
Add SetDeadline and SetWriteDeadline methods to *ndp.Conn (#25)

Add `SetDeadline(time.Time) error` and `SetWriteDeadline(time.Time)
error` methods to `*ndp.Conn` to complement the existing
`SetReadDeadline(time.Time) error` method.
mdlayher/ndp