Bump version for universal wheel (#168)

Author: fredrikaverpil

Qt.py

@@ -69,7 +69,7 @@
 self.__modified__ = list()  # Existing members modified in some way
 
 # Below members are set dynamically on import relative the original binding.
-self.__version__ = "0.6.8.dev2"
+self.__version__ = "0.6.8"
 self.__qt_version__ = "0.0.0"
 self.__binding__ = "None"
 self.__binding_version__ = "0.0.0"