Fix extension in README instructions

README.rst

@@ -1,57 +1,57
 ================================================================
  nbconvert: conversion utilities for the IPython notebook format
 ================================================================
 
 Overview
 ========
 
 nbconvert provides command line utilities to convert to and from IPython
 notebooks and standard formats:
 
 -   ReST
 -   Markdown
 -   HTML
 -   PDF
 -   Python script
 
 As these tools mature, these utilities will be merged into IPython.
 
 Requirements
 ============
 
 The latest development version of doctest is required. This can be installed
 via ::
 
     $ curl http://docutils.svn.sourceforge.net/viewvc/docutils/trunk/docutils/?view=tar > docutils.tgz
-    $ pip install -U docutils.gz
+    $ pip install -U docutils.tgz
 
 Nbconvert also needs the `pandoc multiformat converter
 <http://johnmacfarlane.net/pandoc>`_ to do the actual text conversions.  Pandoc
 is included in most linux distributions package managers, and the author's
 website contains links to Mac OS X and Windows installers.
     
 For conversion to HTML, pygments is also required
 ::
 
     $ pip install pygments
 
 
     
 Running Tests
 =============
 ::
 
     $ pip install nose
     $ nosetests
 
 
 Using nbconvert
 ===============
 
 You will need to either put the source repository in your ``$PATH`` or symlink
 the ``nbconvert.py`` script, as well as the ``css`` and ``js`` subdirectories
 to a directory in your ``$PATH``.  Once this is done, you can call it as::
 
   nbconvert -f <FORMAT> notebook.ipynb
 
 Use ``nbconvert -h`` for up to date help on the available formats.