New Spoon - Hydrate - Drink Water reminder

[luizanao]

Hydrate

This is a very simple spoon that emits a system pop-up notification every X hours to remind folks to drink water.

Usage:

hs.loadSpoon("Hydrate")
spoon.Hydrate.reminder_interval_minutes = 60
spoon.Hydrate.reminder_days = {"Monday", "Wednesday", "Friday"}
spoon.Hydrate:start()

[cmsj]

@luizanao I know it's been a while since we last discussed this PR, but do you want to proceed with merging it? If so we'll need to figure out a way to handle the docstring issue.

[luizanao]

I am good just closing this out @cmsj - life has been busy and I wont have the time to work on that soon. Dont worry, I am hydrating as much as I can tho!