Adding p as timezone offset, e.g. +02:00

[fboes]

Because the feed validator for ATOM complains about timezone offset being given as +0200 and not as +02:00, I added a slight modification of the o and called it p (like in PHP's date function).

Cheers & thanks for this great lib,
Frank

closes: #148

[axelson]

Looking forward to being able to use this directly! Is there a workaround to use until this lands?

[fboes]

Something like this:

dateFormat(date, 'isoDateTime').replace(/(\d{2})(\d{2})$/, '$1:$2');

[loheander]

As an interrim solution, fixed in https://www.npmjs.com/package/dateformat-light/v/1.3.0

[fboes]

As the original solution is more than 2 years old, I changed it to be mergable to the current official state.

[chase-manning]

@fboes Thanks so much for creating this PR!!! This is such a good idea 😄
Sorry this was not merged earlier, this repo was not under active maintenance at the time.
I would love to merge this now but there are currently some merge conflicts.
Would you be able to please fix these merge conflicts and then I will happily merge this!

[fboes]

Because the merge conflicts were to complicated, I build a completely new solution in #149. Please disregard this pull request. ;)