Add -dt --day-total flag for getting a total amount of hours spent on current day

[Ginkooo]

Hey, what do you think about this feature? It's really helpful if you want to integrate this with i3status bar for example.

[Waishnav]

I don't think its needed. User can see the his/her usage though watcher -ds command either way. Also to integrate watcher with i3status, you can use awk and grep to slice string obtain from the command given above.