Specify minium version of Node (#29)
Specify minium version of Node (#29)

- Versions less than 8.12 do not work with that latest version of utp-native. This
commit at least helps inform users if they don't have a new enough
version of node. This will cause `npm install` to fail if users of the
library have run this comannd `npm config set engine-strict true`.

Signed-off-by: Cody W. Eilar <c951a9dfd6009d72a7222f9697e33f76af2d5e79@Gmail.com>
mafintosh/utp-native,mafintosh/utp-native,mafintosh/utp-native