Bump to version 1.6.0
Bump to version 1.6.0

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

acrisci/i3ipc-python