In a banner message to users on its website, HopStop announced it will no longer be available in October, as Apple said it will be shutting down the popular transit directions app, according to 9to5Mac. Apple acquired HopStop in 2013 in an effort to improve its own transit directions in Apple Maps, and with those improvements coming online when iOS 9 launches on Sept. 16, Apple is shutting down HopStop’s app. The plan will leave some users in…