support for rfc3339 timestamps

[dgeo]

Hi,
Thank you for this wonderful bytes of perl !

Here I made a patch to support rsyslog's time format (rfc3339) before finding out that one is waiting for Syslog::Parser since years here: https://rt.cpan.org/Public/Bug/Display.html?id=63897

May you have a look at it ?

If I can help, I'd be happy to do whatever can make merge happen :)

[GitPuffy]

@dgeo Were you able to get this working in your setup? I am wanting to add rfc3339 style as well.