Version 1.6.0 adds the following bugfixes and features:
- Properly tear down subscription socket (#83)
- Implement send_tick message and tick event
- Add a timeout parameter to the main function
- Implement GET_BINDING_MODES
- Implement GET_CONFIG
- Implement GET_MARKS
- Fix pickling of types by fixing a _ReplyType exception (#89)
- Add the sticky property
