adobe-air-sdk 15.0.0.249

Hi!

Adobe AIR SDK has been updated to v15.0.0.249

Also please read back the conversation about more precise version numbering:
https://github.com/Homebrew/homebrew/commit/453ceed27d09608daec8f2f86fab6776004a07e0
(I don't know what changes would this need)

Best Regards!
use `15.0.0.249` as the version string here