[perl #116475] automate perldelta "new modules" section

I apologize for the errors and incorrect documentation. I have fixed the usage example, defaulted to comparing the last two versions, fixed the newlines, and now ignore placeholder items. I have clarified the various messages. The reason for the message about CGI and File::Fetch is that it they were not listed as being changed in Module::CoreList for 5.919007, likely because you have not updated Module::CoreList. I have changed the message to make this clearer.

• [perl #116475] automate perldelta "new modules" section by Abir Viqar via RT