Linux support

[c4l1c0]

Seems like the only thing holding the script to run on linux is the scheduler.

I propose these changes to add linux compatibility:

• detect if os is linux
• if true then either run it periodically with cron or add an entry to current user's crontab

I heard that python-crontab works on windows too, but i'm not sure.
But idk if this is necessary, since on linux i can just edit my crontab to run your script everyday with the "-R" argument.

[darkGrimoire]

Thank you for your test with linux! I'm sorry the scheduler for linux hasn't finish yet, as I have little time to research this (I want it to be compatible with mac and linux), but I think I'll try it once the holiday starts.