public StringChangelogGenerator(IEnumerable <IGenericReader <IChange> > readers, IChangeCache cache, string template, IStubbleRenderer renderer)
 {
     _readers  = readers;
     _cache    = cache;
     _template = template;
     _renderer = renderer;
 }
 public ProjectChangelogGenerator(IEnumerable <IGenericReader <ProjectChange> > readers, string template, IStubbleRenderer renderer)
 {
     _readers  = readers;
     _template = template;
     _renderer = renderer;
 }