[
  {
    "category": "``memory management``", 
    "description": "Resolve a potential memory leak when creating lots of clients on Python 2.6 and Linux 2.6", 
    "type": "bugfix"
  }, 
  {
    "category": "``presign url``", 
    "description": "Now generate_presigned_url() works correctly with different expiry time", 
    "type": "bugfix"
  }
]
