Corrected link to bootstrap example script of fassembler. Fixes #99.

Author: jezdez

docs/index.txt

@@ -172,7 +172,7 @@ Here's a more concrete example of how you could use this::
     f = open('blog-bootstrap.py', 'w').write(output)
 
 Another example is available `here
-<https://svn.openplans.org/svn/fassembler/trunk/fassembler/create-venv-script.py>`_.
+<https://github.com/socialplanning/fassembler/blob/master/fassembler/create-venv-script.py>`_.
 
 activate script
 ~~~~~~~~~~~~~~~