message: Add release notes for 1.12.2 to the master branch
diff: +# Release 1.12.2
  +
  +## Bug Fixes and Other Changes
  +
  +* Fixes a potential security vulnerability where carefully crafted GIF images
  + can produce a null pointer dereference during decoding.
  +
  # Release 1.13.0
  ## Major Features and Improvements
  