Add feature which allows users to make the plugin insert a new line after the header license.

Hello!

I just started working with this absolutely awesome plugin, however, even after going through the source codes of it, I was not able to figure out one thing. And maybe I am just extremely dumb, or I also might overlooked something (okay, this is no different from being dumb), but really, how do people do this? I mean, is there any way to insert a new line just after the end of the license header? Or, am I perhaps the only one who finds this feature crucial?

Anyway, I decided to add this feature myself and just wait for your thoughts on this matter.

The changes I made were all tested in many different cases and should work just fine.

Cheers!