• #784: Sync logs for address books were not correctly cleaned up after
  deleting them.
• #787: Cannot use non-seekable stream-wrappers with range requests.
• Faster XML parsing and generating due to sabre/xml update.
• #793: The Sqlite schema is now more strict and more similar to the MySQL
  schema. This solves a problem within Baikal.
• The zip release ships with sabre/vobject 4.0.3,
  sabre/http 4.2.1, sabre/event 3.0.0,
  sabre/uri 1.1.0 and sabre/xml 1.4.1.