Bump to version 1.3.0

Version 1.3.0 adds the following bugfixes and features:

* Remove python-xlib dependency by getting the socket path from i3
binary.
* The `Con::command_children()` method should work properly.
* Make `socket.recv()` robust against interruptions.
* Change `Con::mark` to `Con::marks` for the new ipc api (might be
breaking).
* Add `Con::window_rect` and `Con::deco_rect` properties.
* Fix encoding problems in reading README.
* `Con::workspace()` returns self if it is a workspace instead of None.
* Fix the ipc-shutdown event.
* The library is now installed as a directory instead of a single file.
* Make the main loop work in multi-threaded environments.
* Add Travis CI.
* Add a test suite.
* Add robustness against UTF-8 errors by replacing bad UTF-8.

setup.py

@@ -9,7 +9,7 @@
 
 setup(
     name='i3ipc',
-    version='1.2.0',
+    version='1.3.0',
     description='An improved Python library for i3wm extensions',
     long_description=long_description,
     url='https://github.com/acrisci/i3ipc-python',