Add release build

[renatobenks-zz]

Today, has not option in require('generate-changelog').generate; to generate a version with a build number of this version. Something like: 4.0.0-1 where -1 is a version number as 1.

I mean, there's should an option like this way:

// v4.0.0-1
require('generate-changelog').generate({ build: true });

what do you think?

I'm already doing this.