reStructuredText syntax fix for issue #1

README.rst

 View **colored**, **incremental** diff in unified format or **side by side**
 with **auto pager**.  Requires python (>= 2.5.0) and ``less``.
 
-.. image: http://ymattw.github.com/cdiff/img/default.png
+.. image:: http://ymattw.github.com/cdiff/img/default.png
    :alt: default
 
-.. image: http://ymattw.github.com/cdiff/img/side-by-side.png
+.. image:: http://ymattw.github.com/cdiff/img/side-by-side.png
    :alt: side by side
 
 Installation
 whatever directory which is in your ``$PATH``, for example, ``$HOME/bin`` is in
 my ``$PATH``, so I save the script there and name as ``cdiff``.
 
+.. code:: shell
+
     curl -ksS https://raw.github.com/ymattw/cdiff/master/src/cdiff.py > ~/bin/cdiff
     chmod +x ~/bin/cdiff
 
 You can run the setup.py from the source to install ``cdiff`` to system wide
 directory.
 
+.. code:: shell
+
     git clone https://github.com/ymattw/cdiff.git
     cd cdiff
     sudo ./setup.py install
 to enable side by side view, and option ``-w N`` to set a text width other than
 default ``80``.  See examples below.
 
-Show usage:
+Show usage::
 
     cdiff -h
 
 View a diff (patch) file:
 
+.. code:: shell
+
     cdiff foo.patch             # view colored incremental udiff
     cdiff foo.patch -s          # view side by side
     cdiff foo.patch -s -w 90    # use text width 90 other than default 80
 
 Read diff from local modification in a svn, git, or hg workspace:
 
+.. code:: shell
+
     cd proj-workspace
     cdiff
     cdiff -s
 
 Pipe in a diff:
 
+.. code:: shell
+
     svn diff -r PREV | cdiff -s
     git log -p -2 | cdiff -s
     git show <commit> | cdiff -s
 
 Redirect output to another patch file is safe:
 
+.. code:: shell
+
     svn diff | cdiff -s > my.patch
 
 Known issue