Bump to version 1.5.0

Version 1.5.0 adds the following bugfixes and features:

* fix bug where floating nodes are not in the tree
* add support for SWAYSOCK and other fixes for sway

setup.py

@@ -9,7 +9,7 @@
 
 setup(
     name='i3ipc',
-    version='1.4.0',
+    version='1.5.0',
     description='An improved Python library for i3wm extensions',
     long_description=long_description,
     url='https://github.com/acrisci/i3ipc-python',