Airbourne have revealed that they will be releasing a new self-titled album on August 28. Vocalist/guitarist Joel O’Keeffe announced the record with an open letter to the late Lemmy Kilmister (Motörhead). O’Keeffe said the following: “Dear Lemmy, Well, mate, it’s been a long time since we’ve said “g’day” or shared a stage together. We’ve never…