Feature request: support for six field cron expressions

[Macinto5h]

There are some applications (i.e. Spring) that use a sixth field for cron expressions to represent seconds.

The option to have a sixth field represented in a generator would be ideal for these use cases.

[codegeek1001]

Hi there, interesting idea. Will consider it for a future release. Been a bit slow on this project but getting back again.