Option to never make empty slices

[nphmuller]

Currently the default is to make a slice a random size between 0 and 100 (the upper limit is settable).
Are you open for an option to change to lower limit from 0 to 1? So that faker never generates a random empty slice?

[makon]

Or at least make the min number settable, too?

Edit: There is already an MR: #130