Replace jade references by pug

[aurium]

• nodemon -v: 1.19.1

Expected behaviour

Display the actual template engine name, and use it in defaults.

Actual behaviour

Using the old name.

Steps to reproduce

See nodemon -h

[stale]

This issue has been automatically marked as idle and stale because it hasn't had any recent activity. It will be automtically closed if no further activity occurs. If you think this is wrong, or the problem still persists, just pop a reply in the comments and @remy will (try!) to follow up.
Thank you for contributing <3

[aurium]

.jade is deprecated. We must use .pug.

[stale]

This issue has been automatically marked as idle and stale because it hasn't had any recent activity. It will be automtically closed if no further activity occurs. If you think this is wrong, or the problem still persists, just pop a reply in the comments and @remy will (try!) to follow up.
Thank you for contributing <3