Add option to choose countdown unit

[StarcraftSu]

Hello Sir,

Thank you for your awesome work which makes my life easier. However, I have a proposal to make it even more awesome. I suggest to add an option for choosing an upper-limit count down unit. What I mean is, like right now, the upper limit unit is days. What if I want a count-down based on month. Or just based on hours, minutes and seconds. Such as the image below:

Again, thanks for your hard work

[PButcher]

This is on my to do list. I've needed that feature myself but got lazy and just decided to hide the day counter. I'll mark this as an enhancement and I hope to get to it at some point. Thanks for the feedback!

[PButcher]

This is now being worked on in #24.