SPRINGFIELD — Gov. Bruce Rauner is seeking tweaks to a measure aimed at changing how constitutional amendments are disseminated to the public.But the chief sponsor of the bill this week said Rauner is really trying to kill the idea because it takes a step toward eliminating his lieutenant’s job.The Republican governor used his veto pen this month on House Bill 348, which requires information about proposed constitutional changes be posted online. It would also end mailers about them in one specific case — …