Bump to version 1.1.6

Version 1.1.6 adds the following bug fixes

* Use enum-compat instead of enum34
* Safely set window class and instance (fixes crashes for windows with
no class or instance)

Author: Tony Crisci

setup.py

@@ -8,7 +8,7 @@
 
 setup(
     name='i3ipc',
-    version='1.1.4',
+    version='1.1.6',
     description='An improved Python library for i3wm extensions',
     long_description=long_description,
     url='https://github.com/acrisci/i3ipc-python',