Fix and update documentation concerning i3wm

update dependencies for xrandr and i3ipc, fix a typo

docs/source/installation.rst

@@ -30,8 +30,9 @@ Generic requirements
   with bazaar repositories.
 * ``pyuv`` python package. Required for :ref:`libuv-based watcher 
   <config-common-watcher>` to work.
-* ``i3-py``, `available on github <https://github.com/ziberna/i3-py>`_. Required 
-  for i3wm bindings and segments.
+* ``i3-ipc`` python package. Required for i3wm bindings and segments.
+* ``xrandr`` program. Required for the multi-monitor lemonbar binding and the 
+  :py:func:`powerline.listers.i3wm.output_lister`.
 
 .. note::
     Until mercurial and bazaar support Python-3 or PyPy powerline will not 

powerline/listers/i3wm.py

@@ -28,7 +28,7 @@ def workspace_lister(pl, segment_info, only_show=None, output=None):
 
 	Sets the segment info values of ``workspace`` and ``output`` to the name of 
 	the i3 workspace and the ``xrandr`` output respectively and the keys
-	``"visible"``, ``"urgent"`` and ``"focused`` to a boolean indicating these
+	``"visible"``, ``"urgent"`` and ``"focused"`` to a boolean indicating these
 	states.
 
 	:param list only_show: