3.28.2 - 2018-03-27
-------------------

* setup.py: Don't install the test C extension when it's built. :issue:`181`
* setup.py: Always define PY_SSIZE_T_CLEAN. :issue:`185`
* Fix __str__ return type of Gtk.TreePath with depth == 0. :issue:`143`
* Fix a crash when setting a str property with a value containing surrogates.
  :issue:`169`
* tests: Fix a potential crash during tests